Which one of the following statements about a fixed-rate mortgage (FRM) loan is correct?

Group of answer choices

a. The monthly payment of the FRM loan changes over the life of the loan.

b Each monthly payment contains the interest payment component and principal repayment component. The size of each component remains unchanged over the life of the FRM loan.

c Each monthly payment contains the interest payment component and principal repayment component. As time goes by, the size of the interest component increases and the size of the principal component decreases, but the sum of the two components remain unchanged.

d Each monthly payment contains the interest payment component and principal repayment component. As time goes by, the size of the interest component decreases and size of the principal component increases, but the sum of the two components remain unchanged.