Rena transferred a balance of $2150 to a new credit card at the beginning of the year. the card offered an introductory apr of 5.9% for the first 3 months and a standard apr of 30.2% thereafter. if the card compounds interest monthly, which of these expressions represents rena's balance at the end of the year? (assume that rena will make no payments or new purchases during the year, and ignore any possible late payment fees.) a.(2150)(1+00.59/12)^3(1+0.302/12)^ 12 b.(2150)(1+00.59/3)^12(1+0.302/9)^1 2 c.(2150)(1+00.59/12)^3(1+0.302/12)^ 9 d.(2150)(1+00.59/3)^9(1+0.302/9)^3