Consider the Following Project -Compute the Slack Time for Activity C

Consider the following project.
$$\begin{array} { | c | c | c | } \hline \text { Activity } & \begin{array} { c } \text { Imunediate } \\\text { Predecessor }\end{array} & \begin{array} { c } \text { Activity Time } \\\text { (drys) }\end{array} \\\hline \text { A } & - - & 3 \\\hline \mathrm { B } & - - & 4 \\\hline \mathrm { C } & \mathrm { A } & 4 \\\hline \mathrm { D } & \mathrm { A } & 6 \\\hline \mathrm { E } & \mathrm { B } & 5 \\\hline \mathrm { F } & \mathrm { C } , \mathrm { D } & 4 \\\hline \mathrm { G } & \mathrm { E } _ { \mathrm { F } } \mathrm { F } & 7 \\\hline\end{array}$$
-Compute the slack time for activity C.

A) 0
B) 4
C) 2
D) 3