The following table is an activity list that includes the duration and predecessor for a series of project activities. What is the duration of the critical path?

Activity

Duration

Predecessor

A

B

$2$

$4$

C

D

E

F

$6$

$3$

$7$

$2$

End

Start

A$,$ E

A

B$,$ C Start

E

D$,$ F

A$-11$

B$-14$

C$-9$

D$-13$