What does class of admission mean in box 3 of I-131 form

[doitall3]

Hi

I pursued my mother to migrate to the US and I am filing for her, she is here on a B1/B2 visa. What does class of admission mean in box 3 of I-131 form since she wants advance parole to return to India to settle her things there.

Thanks

 

[Triple Citizen]

Put B-2 there.

What does class of admission mean in box 3 of I-131 form since she wants advance parole to return to India to settle her things there.