multiple of 8?

[GhassanMBA]

I was working on a GMATPrep Test and cam across this DS question, had some trouble:

If x and y are positive integers, is xy a multiple of 8?

1) The greatest common divisor of x and y is 10
2) The least common multiple of x and y is 100

The OA is C

Hope someone can help with this,
Thanks

[papgust]

This question is already discussed.

https://www.beatthegmat.com/common-divisors-t10428.html

[GhassanMBA]

sorry for the redundancy, and thanks for the link