Charlie does the following problem:

3 3 · 3 2 = 3 6 = 3 · 3 · 3 · 3 · 3 · 3 = 729.

Which of the following is a true statement?

He is incorrect because he should have 6 factors of 9.
He is incorrect because he should have only 5 factors of 3.
He is incorrect because he should have 3 factors of 6.
He is correct.