Debt Securities Are Often Called Fixed-Income Securities Because

Debt securities are often called fixed-income securities because

A) the government fixes the maximum rate that can be paid on bonds.
B) they are held predominantly by older people who are living on fixed incomes.
C) they pay a fixed amount at maturity.
D) they promise either a fixed stream of income or a stream of income determined by a specific formula.
E) they were the first type of investment offered to the public which allowed them to "fix" their income at a higher level by investing in bonds.