The term-structure of interest rates shows the mathematical relationship between:

1. Maturities and yield-to-maturity of coupon bonds
2. Maturities and yield-to-maturities of zero coupon bonds
3. Maturities and coupon rates of bonds
4. Coupon rates and yield-to-maturities
5. Yield-to-maturity and riskiness of bonds

Suppose that we would like to discount (to the present) a cash flow that will be received t years in the future. What would be the appropriate discount factor by which we should multiply the cash flow?

1. (1+yt)t
2. 1/ytt
3. 1/(1+yt)
4. 1/(1+yt)t