To answer this question, we need to understand the rules for valid XML names.

According to the XML specification, a valid XML name must adhere to the following rules:

1. It must start with a letter, underscore (_), or a colon (:).
2. The remaining characters can be letters, digits, hyphens (-), underscores (_), or colons (:).

Let's go through each option to determine which one(s) are valid XML names:

Option A) 1-2-4_6 - This option does not start with a letter, underscore, or colon. Therefore, it is not a valid XML name.

Option B) :3:-3:5:-7 - This option starts with a colon, which is allowed. The remaining characters include numbers, hyphens, and colons, which are also allowed. Therefore, option B is a valid XML name.

Option C) ;123456 - This option starts with a semicolon (;), which is not allowed. Therefore, it is not a valid XML name.

Option D) 3:4;-7 - This option starts with a number, which is not allowed. Therefore, it is not a valid XML name.

The correct answer is B. This option is a valid XML name because it adheres to the rules mentioned above.

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