The correct IUPAC name of the following compound is:

The longest continuous carbon chain contains 6 carbon atoms, identifying the parent alkane as hexane. 

The molecule has two alkyl branches: an ethyl group and a methyl group.

Numbering from either end results in the same locant set (3, 4). According to IUPAC rules, when locants are identical from both sides, the lower number is assigned to the substituent that comes first alphabetically.

Ethyl (E) precedes Methyl (M). Thus, Ethyl is assigned position 3 and Methyl is assigned position 4.

IUPAC Name: 3-ethyl-4-methylhexane