If annual demand is $50,000$ units, the ordering cost is $$25$ per order and the holding cost is $$5$ per unit per year, which of the following is the optimal order quantity using the fixed$-$order quantity model?

A$.707$

B$.634$

C$.141$

D$.500$

E$.$ None of the above

For an activity in a CPM analysis, the Earliest Start time is $8$ days and the Latest Start time is $10$ days. Activity duration is $4$ days. Which of the following statements is true?

A$.$ The Latest Finish is $12$ days

B$.$ The Earliest Finish is $10$ days

C$.$ The slack for this activity is $2$ days

D$.$ Delaying this activity by $4$ days will not affect project duration

E$.$ None of the above