Answer the following questions in the highlighted cells below:

How many two$-$way cameras are required in the optimal solution?

In which openings are they located?

Suppose that management wants to provide additional security coverage for room $7.$ Specifically, management wants room $7$ to be covered by two cameras. Update your model to account for this additional coverage. What is the minimum number of two$-$way cameras required to meet these coverage requirements?

For the updated model in part c$),$ in which openings are the cameras located?