A project has three paths.$$ A$-$B$-$C has a length of $20$ days.$$ A$-$D$-$C has a length of $30$ days.$$ Finally, A$-$E$-$C has a length of $25$ days. Which one of the following statements is

true$?$

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Part $1$

A$.$

$$A$-$D$-$C has the most slack.

B$.$

The expected duration of this project is $20+30+25=75$ days.

C$.$

$$A$-$D$-$C is the critical path.

D$.$

The expected duration of this project is $20$ days.