If the yield curve is upward sloping, which of the following statements is correct?

Select one:

a.The default risk premium on T-bonds decreases as years to maturity (T) increases.

b.The maturity risk premium on T-bonds decreases as years to maturity (T) increases.

c.The inflation premium on T-bonds could decrease with maturity (T).

d.The real risk-free rate on T-bonds decreases as years to maturity (T) increases.

e.The liquidity risk premium on T-bonds decreases as years to maturity (T) increases.