The Alternative Hypothesis When Using the Z-Test for the Difference $\pi_{1}=\pi_{2}$

Multiple Choice

The alternative hypothesis when using the Z-test for the difference between the proportions for two groups is:

A) $\pi_{1}=\pi_{2}$
B) $\pi_{1} \neq \pi_{2}$
C) $\pi_{1} \times \pi_{2}=2$
D) $\pi_{1} / \pi_{2}=2$