You are tracking a project in Microsoft Office Project Standard 2007. When creating a task, you enter an estimated duration and assign one resource. The task might require additional effort and resources. You will make these changes as the scope of the task becomes clearer over the project lifecycle. You need to ensure that if you add resources to the task, work will increase. What task type should you use?

A.
fixed work

B.
fixed units, effort-driven

C.
fixed duration, effort-driven

D.
fixed units, non effort-driven