When considering the riskiness of a bond, a positive maturity risk premium implies that generally

a$.$ investors disregard the investment horizon when choosing between long$-$and short$-$term bonds.

b$.$ reinvestment risk is a factor only professional investors can accurately predict.

c$.$ investors will choose a long$-$term bond over a short$-$term bond.

d$.$ duration is irrelevant when calculating risk.

e$.$ investors regard long$-$term bonds as being riskier than short$-$term bonds.