Given the tasks with their duration and dependency

$$

Task

Immediate predecessor

Time $($weeks$)$

A

$-$

$1$

B

$-$

$2$

C

A$,$ B

$3$

D

B

$1$

E

C

$3$

F

C$,$D

$2$

G

E$,$ F

$4$

$$

Work alone to do the following:

a$)$ Build the Activity On Node Network to compute the ES$,$ EF$,$ LS and LF

b$)$ Compute the Slack Time

c$)$ Determining the Critical Path

d$)$ Determine the project duration

: