Suppose you have received a credit card offer from a bank that charges interest at $1\mathrm{.}3\%$ per month, compounded monthly. What is the nominal interest $($annual percentage$)$ rate for this credit card? What is the effective annual interest rate?

a$.$ ia $=15\mathrm{.}6\%,$ r $=16\mathrm{.}77\%$

b$.$ ia $=16\mathrm{.}77\%,$ r $=15\mathrm{.}6\%$

c$.$ ia $=15\mathrm{.}77\%,$ r $=12\mathrm{.}6\%$

d$.$ none of the above