What is the IUPAC name of the given compound? 

N,N-Dimethylmethanamine

The correct answer is option 3. N,N-Dimethylmethanamine

The compound is a tertiary amine with three methyl substituents. One of the methyl groups is considered as the parent chain with the N atom and the other two acts as substituents. These are represented by N, N- as they are the same groups and are directly attached to the nitrogen atom.