In the Bank Location problem, four of the twenty counties were on adjacent to Pennsylvania. (Counties 1, 14, 15, 16.) If the bank president wanted to be sure that at least one bank was located in one of these counties, what constraint would need to be added to the model?
a. x1 + x14 + x15 + x16 > 1
b. x1 + x14 + x15 + x16 >= 1
c. x1 + x14 + x15 + x16 = 1
d. x1 + x14 + x15 + x16 <= 1

Telecom co. enters into a two-year contract with a customer to provide wireless service (voice and data) for $40 per month. to induce customers, telecom co. provides a free phone. telecom co. normally sells the phone on a stand-alone basis for $200. telecom co. also charges the customer a one-time activation fee of $35.which of the following is true? a) there are two distinct performance obligations: the voice service and the data service b) the free phone constitutes as a marketing expense c) the activation fee is a separate performance obligationd) there are two distinct performance obligations: the wireless services and the phone