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

Group of answer choices

$0$

$21$

$5$

What is the slack time for activity C$?$

Group of answer choices

$0$

$13$

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

Group of answer choices

$12$

$28$

What is the earliest finish $($EF$)$ time for activity C$?$

Group of answer choices

$8$

$12$

What is the estimated completion time of the project?

Group of answer choices

$17$

$30$