Consider the following Activity$-$On$-$Node $($AON$)$ project $($activity completion times are in days$).$

it is also a project network showing where node A is starting node and node F is the destination node with different network layout. The numbers above each node indicate the duration time to finish the each node.

Refer to the figure. What is the critical path?

A$.$

ACDF

B$.$

ABEF

C$.$

ABDF

D$.$

ACEF

E$.$

none of the above