You are entering tasks in a project plan in Microsoft Office Project Standard 2007. Each task has an estimated duration. You need to make sure that no task in this project plan has a question mark in its Duration field. What should you do?

A.
Disable the option to show that tasks have estimated durations.

B.
Change the width of the Duration column so the question mark is not visible.

C.
Create a new project plan based on a template that does not have estimated durations.

D.
Re-enter the same durations so the question marks representing the estimates disappear.