EIFS
The Extended Interframe Space (EIFS) is used when a station receives a frame which fails the Frame Check Sequence (FCS), in which case it waits an EIFS to give the sending station an opportunity the retransmit. The EIFS is the longest of all IFS and so is called “Extended”. I also like to think of the “E” representing that an error may have occurred which helps me to relate it back to a failed FCS.
Answer is D - When a frame is received with errors or corrupted the receiver will respond with EIFS which tells the sender to wait for a longer period so it can see if the packet was delivered correctly. Once this happens, it will start go back to using a normal DIFS or AIFS
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