The Null Hypothesis in an Independent-Samples T-Test Would Be Represented $$H _ { 0 } : \mu _ { 1 } = \mu _ { 2 }$$

The null hypothesis in an independent-samples t-test would be represented as follows:

A) $$H _ { 0 } : \mu _ { 1 } = \mu _ { 2 }$$
B) $$H _ { 1 } : \bar { X } _ { 1 } \neq \bar { X } _ { 1 }$$
C) $$H _ { 0 } : \bar { X } _ { 1 } \neq \bar { X } _ { 1 }$$
D) $$H _ { 1 } : \mu _ { 1 } = \mu _ { 1 }$$