In Using the Z-Test for Comparing Two Proportions,the Null Hypothesis $\pi_{1}=\pi_{2}$

Multiple Choice

In using the Z-test for comparing two proportions,the null hypothesis is typically stated as:

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