Which are perfect square trinomials? Choose two correct answers.

A perfect square trinomial has the form a² + 2ab + b² or a² − 2ab + b². Choice D is x² + 10x + 25 = (x + 5)², and choice E is x² − 4x + 4 = (x − 2)². The other choices do not have the matching middle and constant terms needed to form a squared binomial.

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