Nancy invested $9 000 in a five-year GIC (guaranteed investment certificate) at 3.06% compounded monthly. After the first 2 years, the interest rate increased to 3.57% compounded quarterly. How much is her investment worth at the end of the 5-year period? a. $9206.59 b. $10647.10 c. $10642.09 d. $10643.74