You have $12,000 to invest. One bank pays 8% interest compounded semiannually and a second bank pays 3.9% interest compounded monthly. Complete parts (a) and (b). a. Use the formula for compound-interest to write a function for the balance in each bank at any time t Write a function for the balance in the first bank at any time t. Choose the correct answer below. OA. A=12,000(1.0133)2 OC. A=12,000(0.96) OE. A=12,000(1.04)21 OB. A=12,480 OD. A=12,000(1.08) OF. A=12,000(0.04)