Identify the following interest rates as nominal or effective: (ABET, SO1) A: i%= 6% per semiannual, compounded monthly B: i%= 7% per year, compounded quarterly C: i%= 1.4% per month Select one: Oa. All of them are nominal Ob. A and C are effective, and B is nominal rate Oc. C is effective, and A and B are nominal rates Od. All of them are effective Oe. A is effective, and B and Care nominal rates