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Moderate

Prime Factors, Multiple Exponents

ALGEBR-IBVXE8

What are the prime factors of $42x^{2} y^{2}$?

A

$2, 21, x, x, y, y$

B

$2, 3, y, x, x, y, y$

C

$2, 3, 7, x, x, y, y$

D

$6, 7, x, x, y, y$