Bit stuffing refers to
(A) inserting a 0 in user stream to differentiate it with a flag
(B) inserting a 0 in flag stream to avoid ambiguity
(C) appending a nipple to the flag sequence
(D) appending a nipple to the use data stream
Answer: (A)
Explanation: Bit stuffing is the insertion of non information bits into data. Note that stuffed bits should not be confused with overhead bits. Overhead bits are non-data bits that are necessary for transmission (usually as part of headers, checksums etc).
Refer : Bit Stuffing
Option (A) is correct.
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