QUESTION $50$

Activity $C$ has an early start time $($ES$)$ of day $8,$ an early finish time $($EF$)$ of day $12,$ a latest start time $($LS$)$ of day $13,$ and a latest finish time $($LF$)$ of day $17.$ Its slack time is

a$.6$ days

b$.3$ days

c$.4$ days

d$.5$ days

e$.2$ days