What function does the Frame Check Sequence (FCS) perform?

A. The FCS will error-correct data in a frame.
B. The FCS will detect errors in a frame’s data.
C. The FCS is used for acknowledgment of receipt of the frame.
D. Both A and B

B. The Frame Check Sequence is a 4-byte cyclical redundancy check (CRC) calculation. Its only function is to detect erroneous frames; it will not correct data and contains no parity to do so.