What is the correct structure for the following ketone?
1,1-dichlorohexan-2-one

Chemical structure of 1,1-dichlorohexan-2-one with chlorine and carbon atoms.

Chemical structure of 1,1-dichlorohexan-2-one showing a different arrangement of chlorine atoms.

Chemical structure of 1,1-dichlorohexan-2-one with three chlorine atoms positioned on the carbon chain.

Chemical structure of 1,1-dichlorohexan-2-one with the carbonyl group and chlorine atoms.