Which statement is a proper biconditional statement formed from the conditional statement: a) If an angle is bisected, then it is divided into two congruent angles.
b)if an angle is not bisected, then it is not divided into two congruent angles.
c)If an angle is not divided into two congruent angles, then it is not bisected.
d)If an angle is divided into two congruent angles, then it is bisected.
e)An angle is bisected if, and only if, it is divided into two congruent angles.