periods	years to maturity	spot rate
1	0.5	5.0%
2	1	5.4%
3	1.5	5.8%
4	2	6.4%
5	2.5	7.0%
6	3	7.2%
7	3.5	7.4%
8	4	7.8%

Suppose that the market price of a 4-year 6% coupon non-Treasury issue is $91.4083

Determine whether the zero-volatility spread (Z-spread) relative to the Treasury spot rate

curve for this issue is 80 basis points, 90 basis points, or 100 basis points.