Use the following problem statement to answer questions $1-5.$

The project network below shows activity times $($in weeks$)$ and their precedence relationships.

What is the earliest start $($ES$)$ time for activity C$?$

$0$

$5$

$21$

What is the critical path?

BCDE

BCE

What is the latest finish $($LF$)$ time for activity D$?$

$28$

$12$

What is the estimated completion time of the project?

$17$

$30$

What is the slack time for activity C$?$

$13$

$0$