Question $5(3$ points$)$

Consider the following Activity$-$On$-$Node $($AON$)$ PERT project. The three values that represent each activity's completion time $($in days$)$ correspond to an optimistic time, most likely time, and pessimistic time, respectively. What is the expected completion time of the critical path?

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$20$ days

$19$ days

$14$ days

$23$ days