Parallelogram ABCD is a rectangle. Which statements are true? Select each correct answer. m∠ABX=m∠CBX 2AX=BD BC=CX AD⎯⎯⎯⎯⎯⊥CD⎯⎯⎯⎯⎯⎯ A) m∠ABX=m∠CBX    B) 2AX=BD    C) BC=CX     D) AD⎯⎯⎯⎯⎯⊥CD⎯⎯⎯⎯⎯⎯