Which of the following is true about the "credit spread" in the context of Canada?

A$)$ The credit spread is the difference between the YTM of a bond that has

default risk and a Government of Canada bond of the same maturity.

B$)$ The credit spread is the difference between the YTM of a long$-$term

Government of Canada bond and a short$-$term Government of Canada bond.

C$)$ The credit spread is the difference between the YTM of a coupon$-$paying

Government of Canada bond and a zero$-$coupon Government of Canada

bond of the same maturity.

D$)$ The credit spread is the risk premium added to the risk$-$free rate to get a

discount rate for valuing risky cash flows.