Which polynomial function has a leading coefficient of 1 and roots 2i and 3i with multiplicity 1?

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Which polynomial function has a leading coefficient of 1 and roots 2i and 3i with multiplicity 1?

a. f(x) = (x – 2i)(x – 3i)
b. f(x) = (x + 2i)(x + 3i)
c. f(x) = (x – 2)(x – 3)(x – 2i)(x – 3i)
d. f(x) = (x + 2i)(x + 3i)(x – 2i)(x – 3i)