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Construction Management - Engineering

Q1:

Pick up the correct statement from the following:

A Forward pass is used for calculating earliest expected time

B Backward pass is used for calculating the latest occurence time

C Maximum value of earliest expected time is used if there are more than one value of any event

D Minimum value of latest occurrence time is used if there are more than one value of any event

E All the above.

ANS:E - All the above.

What is pass here? Please explain me.