Pert and cpm
a. have been combined to develop a procedure that uses the best of each.
b. have different features and are not applied to the same situation.
c. do not require a chronological relationship among activities.
d. are most valuable when a small number of activities must be scheduled.

Answer is option a, i.e. have been combined to develop a procedure that uses the best of each.

Explanation:

In project management, PERT i.e. project evaluation and review technique is used as a statistical tool that is used to assess the overall work that is done to complete a certain project. In order to complete a particular task, there can be 'n' number of paths or ways. The best decision of selecting a pathway that is time-saving as well as cost-saving is to be found out. This chosen path is then referred to as 'Critical path.' Hence, PERT and CPM can be understood as two faces of a single coin, and have been combined to develop a procedure that uses the best of each.

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explanation: