In Order to Test the Following Hypotheses at An $\alpha$ Level of Significance,
H₀

In order to test the following hypotheses at an $\alpha$ level of significance,
H₀: $\mu$ ₁- $\mu$ ₂ $\le$ 0
H_a: $\mu$ ₁- $\mu$ ₂ > 0
The null hypothesis will be rejected if the test statistic Z is

A) $\le$ Z _$\alpha$
B) $\ge$ Z _$\alpha$
C) < -Z _$\alpha$
D) < 0