If Zero Rates (Also Known as Discount Rates)are Positive for Any

Multiple Choice

If zero rates (also known as discount rates) are positive for any maturity,the discount function $d ( t )$ ,which gives the present value of a dollar receivable at time $t$ in the future,

A) Must be between 0 and 1
B) Must be greater than 0 and can be greater than 1
C) Can be a negative number
D) is usually 0.99