What Is the IUPAC Name for the Following Compound $\alpha$ $\alpha$

Multiple Choice

What is the IUPAC name for the following compound?

A) 2,2-dimethylbutanenitrile
B) 3,3-dimethylbutanenitrile
C) ( $\alpha$ , $\alpha$ -dimethylbutyronitrile)
D) ( $\beta$ , $\beta$ -dimethylbutyronitrile)
E) ( $\gamma$ , $\gamma$ -dimethylbutyronitrile)