Which I94 ? (Approved H4, Pending H4 EAD)

Every forum says a candidate can work for 180/540 days with their H4 EAD receipt i.e with a non-expire I-94. Confusing is which with I-94?
Is it Arrival/Departure entry i94 or an i94 at the bottom of H4 approval

Its the most recent i94. It could be the paper one attached to i797 or the one you got at airport.

Only the most recent one is considered active.

Thanks for clarifying