You need to create a summary task from an Outline Level 1 task

In Microsoft Office Project Standard 2007, you are viewing a project plan in the default Gantt Chart view. You need to create a summary task from an Outline Level 1 task. What should you do?

A.
Set the Outline Level 1 task as a milestone.

B.
Indent the subtasks that appear below the intended summary task.

C.
Create start-to-start dependencies between the summary task and the subtasks.

D.
Edit the Work Breakdown Structure (WBS) code to remove all but the first-level code.