Show all work for problems $4$ and $5.$

$4.$ Given the following network:

$($a$)$ What is the critical path?

$($b$)$ How long will it take to complete this project?

$($c$)$ Can activity B be delayed without delaying the completion of the project? If so$,$ how many days?

$5.$ Given the estimated activity times below and the network in Problem $4$ above

$\backslash$table$[[$Activity$,a,m,b$