Consider the following project network and activity times $($in days$).$

A project network is given with the starting point on the left and the finish point on the right with activities A through G$.$ The arcs between the activities are listed as follows.

Start to A and to B$.$

A to C$.$

B to D$.$

C to E and to F$.$

D to E and to F$.$

E to Finish.

F to G$.$

G to Finish.

Activity A B C D E F G

Time $2246722$

The crashing data for this project are as follows.

Time $($days$)$ Cost $($$$)$

Activity Normal Crash Normal Crash

A $217001,300$

B $211,3002,000$

C $421,9002,700$

D $641,4002,200$

E $751,7002,700$

F $217001,100$

G $21400900$

$($a$)$

Find the critical path. $($Enter your answers as a comma$-$separated list.$)$