$17.$ A project consists of the following four activities with activity times in days:

Activity

Predecessor

Time

A

$6$

B

A

$5$

C

A

$4$

D

B$,$C

$8$

Table YY

Using Table YY$,$ the amount of slack associated with activity C is

a$)4$ days.

b$)3$ days.

c$)2$ days.

d$)1$ day.