Pick up the correct statement. Dummy activity on a PERT/CPM chart means, it

Actual performance of a task is called

A. An event

B. An activity

C. A duration

D. None of these

The essential condition for the decompression of an activity is that

A. The project time should change due to decompression

B. After decompression the time of an activity invariably exceeds its normal time

C. An activity could be decompressed to the maximum extent of its normal time

D. None of the above

According to MAPI formula, the old machine should be replaced by new one when
(Here, CAM = Challenger's Adverse minimum, DAM = Defender's Adverse minimum)

A. CAM < DAM

B. CAM > DAM

C. CAM = DAM

D. There is no such criterion

Bar charts are suitable for

A. Minor works

B. Major works

C. Large projects

D. All of the above