Number of odd factors for 10!

GRE Quant Problem Solving
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You can find this problem in https://www.gregmat.com/study-plans/week-1-of-the-two-month-study-plan → Day3 → Quant Practice: All Previous Concepts.

According to Greg, the answer is A-30. But isn’t 30 just the number of POSITIVE odd factors? What about the NEGATIVE odd factors? If we take negative odd factors into consideration, the answer should be 60 i.e. B.

Please help.

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GMAT question - they consider only positive factors.

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Okay… If this question was asked in the GRE, Should the answer be 60?

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More of “ETS would make it clear if you need to consider negative factors or not”

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Thanks a lot for helping! I appreciate your help!