A $5-$year $4\%$ coupon Treasury bond currently sells for $$80.$ A $5-$year $6\%$ coupon Treasury bond currently sells for $$88.$ What is the price of a $5-$year zero$-$coupon Treasury bond? Assume i$)$ all these bonds have a par value of $$100$ and pays coupon semannually. i$)$ There are no arbitrage opportunities. iii$)$ There are no restrictions on short selling. A$.$ $$60$ B$.$ $$64$ C$.$ $$72$ D$.$ $$76$