Consider the following table of activities that describes a project network.$$

Activity Predecessors Normal Duration Normal Cost Max Crash Time Total Crash Cost

A$101,00051,000$

B A $204,000103,000$

C A $52,00042,000$

D B$,$ C $31,0002400$

E B$,$ C $205,000105,000$

F B$,$ C $43,00021,000$

G D$,$ E$,$ F $102,00053,000$

Which activity will you crash first? $($enter the letter only$)$

Which activity will you crash second $-$ after the first activity cannot be crashed anymore? $($enter the letter only$)$