For the project depicted below, a$)$ Compute the ES$,$ EF$,$ LS$,$ and LF times for the network. b$)$ Explain how the ES for Activity $3$ is obtained. c$)$ Explain how the LF time for Activity $1$ is obtained. d$)$ What is the critical path for the project? e$)$ How long do you expect the project to take to complete? Activity $2$ Activity $4$ wks S$-$LF Activity $1-$T$-61$ ES$-$ EF$-$ wks LS LF Activity e$67-2|$ ES$-$ I EF$-$ wks LS LF$-$ Start End Activity $3$ wks LS$-$ LF