Which of the following statements would be represented with P ↔ Q? Question 1 options: A) If a quadrilateral has four congruent angles, then it's a rectangle. B) If a quadrilateral has four congruent sides, then it's either a square or a rhombus. C) A quadrilateral with four congruent sides and four right angles is a square. D) A quadrilateral has four congruent sides and four right angles if and only if it's a square.