Which of the following statements is CORRECT?

a. Inverted yield curves can exist for Treasury bonds, but because of default premiums, the corporate yield curve cannot become inverted.

b. If the yield curve is inverted, short-term bonds have lower yields than long-term bonds.

c. The most likely explanation for an inverted yield curve is that investors expect inflation to increate in the future.

d. The higher the maturity risk premium, the higher the probability that the yield curve will be inverted.

e. Even if the pure expectations theory is correct, there might at times be an inverted Treasury yield curve.