After completing detailed planning for a project, it is often helpful for the project manager and team to apply a sanity test to the project plan. Which of the following accurately describes the application of a sanity test?

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a$.$ It is based largely on the expectations of supervisors and sponsors.

b$.$ It should include questions to ensure budgets, schedules and resource plans are reasonable and achievable.

c$.$ It focuses on whether the project charter should be changed

d$.$ It is primarily focused on the team members.