Which of the following is the method for determining the critical path of a project?

A.
Determine the BAC of a project and the AC at completion; calculate the difference.

B.
Examine the project schedule and determine the two most critical milestones; then calculate the total time from the start of the first determined milestone to the end of the second.

C.
Examine the project schedule and place all scheduled activities on one time-line, regardless as to whether they are being implemented in parallel. Then calculate the total time taken.

D.
Examine the project schedule and calculate the total time taken for all scheduled activities, from commencement of the project to closure, with zero float.