A Convertible Bond's Payback Period

A convertible bond's payback period
1. increases as the bond's coupon increases
2. decreases as the bond's coupon increases
3. increases as the stock's dividend increases
4. decreases as the stock's dividend increases

A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4