$15.$ Kamal plans to offer new, more favorable contracts to business customers who are now receiving a discount and use wireless services. Determine whether each customer should receive a new contract as follows: a$.$ In cell I$5,$ enter a formula using the AND function that tests whether the Wireless value is equal to $"$Y$"$ and whether the Discount value is equal to $"$Y$".$ b$.$ Fill the range I$6$:I$18$ with the formula in cell I$5.$