Which credit bureau is the most popular to use by home loan lenders?

I know the three…Experian, Equifax and TransUnion, but rather then checking all three I was advised that essentially loan/mortgage officers typically use only one to check eligibility for a home loan. What is the most popular credit bureau used? I am in the process of looking for a home, and want to make sure I know which score will be pulled considering all three have different scores.

Thanks!!!

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