Consider two $N-$year bonds, each of which pays annual coupons and is redeemable at par. Bond A has

a par value of $1700$ and pays coupons of $78.$ Bond B has a par value of $2700$ and pays coupons of $39.$

The bonds both have a yield rate of $4\%$ and have the same price. Calculate $N.$

$22$

$25$

$18$

$20$

$23$