What Is Another Form of the Alternative Hypothesis When Testing $\mu$

Multiple Choice

What is another form of the alternative hypothesis when testing the difference between the means of the two groups?

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