Given is a PERT project network diagram as shown below.

a$)$ The Project Completion time $=$

type your answer...

$($in $2$ decimal places$)$

b$)$ The Earliest Start time, ES$,$ of Activity G $=$

in $2$ decimal places$)$

c$)$ The Latest Finish time, LF$,$ of Acitivity $C=$

type your answer...

$($in $2$ decimal places$)$

d$)$ The critical activities are $=$

$($ex$.$ type in critical activities as ABCD $,$ no comma, no space$)$