You create a project plan in Microsoft Office Project Standard 2007 and assign resources to tasks. Some tasks are of high importance. You must not over-allocate resources in the project plan. Before leveling the schedule, you need to ensure that high importance tasks are not affected by this action.
What should you do?

A.
Set high importance tasks to a priority level of 1000.

B.
Set all tasks to a priority level of 200, and then activate the option to clear leveling.

C.
Set normal tasks to a priority level of 200 and high-importance tasks to a priority level of 50.

D.
Set the project summary task to priority level of 1000 and high importance tasks to a priority level of 500.