To answer this question, we need to understand the purpose of each section mentioned.

A. Test plan section - This section typically includes information about the overall approach, objectives, scope, and resources for the testing activities. It may also include details about the test environment, test deliverables, and test execution strategy. The planned start date, end dates, and test milestones are not typically mentioned in this section.

B. Requirements Section - This section usually includes information about the functional and non-functional requirements of the system or software being tested. It may outline the desired behavior, features, and performance expectations. The planned start date, end dates, and test milestones are not typically mentioned in this section either.

C. Test schedule section - This section is specifically dedicated to outlining the planned start date, end dates, and test milestones. It provides a timeline or schedule for the testing activities, indicating when each phase or milestone is expected to occur.

D. Summary section - This section is typically used to provide a concise overview or summary of the key points covered in the test plan. It may include a high-level summary of the objectives, scope, and approach, but it is unlikely to contain detailed information about the planned start date, end dates, and test milestones.

Based on the above explanations, we can conclude that the planned start date, end dates, and test milestones are mentioned in the Test schedule section (Option C).

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