2 The random variable \(X\) has variance \(\operatorname { Var } ( X )\) Which of the following expressions is equal to \(\operatorname { Var } ( a X + b )\), where \(a\) and \(b\) are non-zero constants? Circle your answer.
[0pt] [1 mark]
\(a \operatorname { Var } ( X )\)
\(a \operatorname { Var } ( X ) + b\)
\(a ^ { 2 } \operatorname { Var } ( X )\)
\(a ^ { 2 } \operatorname { Var } ( X ) + b\)