If the Following Project Must Be Completed by Day 18 $\le$

Multiple Choice

If the following project must be completed by day 18 at minimum cost how do we change the LP model?

A) Enter 18 in cell E14.
B) Add a constraint that E14 $\le$ 18.
C) Make cell E14 the target cell.
D) Add a constraint that E14 = 18.