Which frame field is responsible for error checking A Preamb

Which frame field is responsible for error checking?

A. Preamble

B. SFD

C. FCS

D. Length/Type

Solution

C. FCS (Frame Check Sequence)

because the FCS validation is used to identical to FCS generation. If the the incoming frame donot generate CRC value identical to the received CRC, an error has occured and the frame is identified as invalid.