AMC 12 2002a Problem 20

Suppose that $a$ and $b$ are digits, not both nine and not both zero, and the repeating decimal $0.\overline{ab}$ is expressed as a fraction in lowest terms. How many different denominators are possible?

$\text{(A) }3 \text{(B) }4 \text{(C) }5 \text{(D) }8 \text{(E) }9$