Discussion
When data and acknowledgement are sent in the same frame, this is called as
Answer: B
Sending an acknowledgement inside an outgoing data frame, instead of in a separate frame, is called piggybacking (written here as 'Piggy backing'). In a full-duplex data link protocol each side has data of its own to send, so the receiver waits briefly and attaches its acknowledgement to the next data frame heading the same way, which saves bandwidth and frame overhead.
'Piggy packing', 'Back packing' and 'Good packing' are not terms used in networking. They only imitate the real name.
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