Enrique Brava is responsible for upgrading the wireless network for his employer. He has identified seven possible locations to install new nodes for the network. Each node can provide service to different regions within his employers corporate campus. The cost of installing each node and the regions that can be served by each node are summarized below.

Node 1: Regions 1, 2, 5; Cost $700

Node 2: Regions 3, 6, 7; Cost $600

Node 3: Regions 2, 3, 7, 9; Cost $900

Node 4: Regions 1, 3, 6, 10; Cost $1,250

Node 5: Regions 2, 4, 6, 8; Cost $850

Node 6: Regions 4, 5, 8, 10; Cost $1,000

Node 7: Regions 1, 5, 7, 8, 9; Cost $100

A) Define the decision variables

B) Define the objective function

C) Define the decision variables