Answer:
C. the sum of the variances of all activities on the critical path.
Step-by-step explanation:
PERT is an acronym for Program Evaluation and Review Technique. PERT analysis is for task examination scheduling and determination of a variation of the Critical Path Method method. It aims to control cost ND time by analyzing the required time to complete a given task and other related factors.
A PERT chart consists of circles or rectangles which depicts the various milestones of project.