Another Form of the Alternative Hypothesis When Testing the Difference $\mu_{1}-\mu_{2}=0$

Multiple Choice

Another form of the alternative hypothesis when testing the difference between the means of the two groups is:

A) $\mu_{1}-\mu_{2}=0$
B) $\mu_{1}-\mu_{2} \neq 0$
C) $\mu_{1}-\mu_{2}=2$
D) $\mu_{1}-\mu_{2} \neq 2$