If a, b, and c are positive integers, a + b = 12, and bc = 15, then which of the following must be true?

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If <em>a</em>, <em>b</em>, and <em>c</em> are positive integers, <em>a</em> + <em>b</em> = 12, and <em>bc</em> = 15, then which of the following must be true?