Given the following information for an AOA network:

Immediate

Activity

A

B

C

D

Duration $($days$)$

$9$

$2$

$8$

$7$

Predecessor$($s$)$

B$,$ C$,$ D

None

None

None

How many dummy arc$($s$)$ is $($are$)$ there in this AOA network?

Keep your own AOA graph.

Select one:

a$.$ two dummy arcs

b$.$ no dummy arc

c$.$ one dummy arc

d$.$ four dummy arcs

e$.$ three dummy arcs