To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) File parameters - This option is correct because file parameters in a VSAM file can be overridden. File parameters include attributes such as the record length, key length, key position, data organization, and access mode. These parameters can be specified during file creation and can also be overridden during file allocation or opening.

Option B) Performance parameters - This option is incorrect. Performance parameters in a VSAM file, such as buffer size and buffer control, cannot be overridden.

Option C) Space parameters - This option is incorrect. Space parameters in a VSAM file, such as primary space allocation and secondary space allocation, cannot be overridden.

Option D) Volume parameters - This option is incorrect. Volume parameters in a VSAM file, such as volume serial number and device type, cannot be overridden.

The correct answer is A) File parameters. This option is correct because file parameters in a VSAM file can be overridden during file allocation or opening.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) File parameters - This option is incorrect. File parameters in a VSAM file, such as the file organization, record length, and key length, can be overridden when defining or accessing the file.

Option B) Performance parameters - This option is correct. Performance parameters in a VSAM file, such as the buffer size and caching options, cannot be overridden. These parameters are set at the time of file creation and cannot be changed or overridden later.

Option C) Space parameters - This option is incorrect. Space parameters in a VSAM file, such as the primary and secondary space allocation, can be overridden when defining or accessing the file.

Option D) Volume parameters - This option is incorrect. Volume parameters in a VSAM file, such as the volume serial number and device type, can be overridden when defining or accessing the file.

The correct answer is B) Performance parameters. This option is correct because performance parameters in a VSAM file cannot be overridden.

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• Wrong explanation

To answer this question, we need to understand the syntax for the REFDD parameter in a job control language (JCL) statement.

The correct syntax for the REFDD parameter is:

A. REFDD=*.ddname

This syntax specifies that the data set referenced by the DD statement with the given ddname should be used as input for the current step or job.

Let's go through each option to understand why it is correct or incorrect:

Option A) REFDD=*.ddname - This option is correct because it specifies that the data set referenced by the DD statement with the given ddname should be used as input for the current step or job.

Option B) REFDD=*.stepname.ddname - This option is incorrect because it includes the stepname in the REFDD parameter. The REFDD parameter does not require the stepname; it only requires the ddname.

Option C) REFDD=*.jobstepname.procstepname - This option is incorrect because it includes both the jobstepname and the procstepname in the REFDD parameter. The REFDD parameter does not require these names; it only requires the ddname.

Option D) REFDD=*.jobstepname.ddname - This option is incorrect because it includes the jobstepname in the REFDD parameter. The REFDD parameter does not require the jobstepname; it only requires the ddname.

The correct answer is A) REFDD=*.ddname. This option is correct because it specifies that the data set referenced by the DD statement with the given ddname should be used as input for the current step or job.

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• Wrong explanation