Questions $2$ activity arrow$-$diagram is missing

question $1)$ you missed th C Activity has A is the predecssors. you did with no predecsseros.

question $2)$ you missed F Activity has C$,$D predecssors. you did only D

please do it again and I need the Digram too

$1)$Draw an Activity$-$on$-$Node Diagram, identify project duration and project critical path for the following:

Activity name Predecessor$($s$)$ Duration$($week$)$

A None $20$

B none $10$

C A $10$

D A$,$B $40$

E D $10$

F E $20$

$2)$Draw an Activity$-$on$-$Arrow Diagram, identify project duration, slack for each activity, and project critical path for the following:

Activity name Predecessor$($s$)$ Duration$($week$)$

A none $20$

B none $10$

C none $10$

D A$,$B $40$

E C $10$

F C$,$D $20$

G E$,$F $10$

$2)$Draw an Activity$-$on$-$Node Diagram, identify activity duration, slack for each activity,project duration, and project critical path for the following:

Activity name Predecessor$($s$)$ a m b

A none $205090$

B none $103040$

C none $102030$

D A $201030$

E B$,$C $102030$

F C$,$D $203060$

G F $10,2050$