Which name is not correct?

Name: Which name is not correct?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The correct naming of D should be 1,3-dimethylcyclopentane because in cyclic compounds, the substituents are numbered to give them the lowest possible numbers, and the numbering should minimize the sum of the numbers assigned to the substituents. In a cyclopentane ring, a 1,4-disubstitution actually results in the same positioning as a 1,3-disubstitution due to the ring's symmetry, making "1,4-dimethylcyclopentane" an incorrect name.

Which Name Is Not Correct