The critical paths are found by calculating $...?$

A$)$ early start, early finish, late start, late finish

B$)$ predessor$-$to$-$successor

C$)$ start$-$to$-$start, start$-$to$-$finish, finish$-$to$-$finish, finish$-$to$-$start

D$)$ primary$-$to$-$secondary