I need to use the critical path method and draw a network diagram to solve this. NOT early start and late start

$(1).$

The following is a list of tasks that have to be completed as soon as possible.

$($a$).$ What are the critical activities for this project?

$($b$).$ Is the critical path unique? Yes or No

$($c$).$ How soon can the project be completed?

$($d$).$ What is the total float of activity F$?$

$($e$).$ If activity A is made shorter by $1$ hour, would the project take less time to complete? YES or NO$.$

Explain briefly.

$($f$),$ If activity B is made shorter by $1$ hour, would the project take less time to complete? YES or NO Explain

briefly.