Consider the following statements: \( p: \) A parallelogram is a rhombus. \( q: \) The diagonals...

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Consider the following statements:
\( p: \) A parallelogram is a rhombus.
\( q: \) The diagonals are at right angle.
The compound proposition "A parallelogram is a rhombus iff its diagonals are at right angle" is represented by
(A) \( p \vee q \)
(B) \( p \wedge q \)
(C) \( p \rightarrow q \)
(D) \( p \leftrightarrow q \)
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