Answer:
3. Data link layer
Step-by-step explanation:
For a frame to be created in the data link layer, the frame header and trailer must be used to encapsulate the packet from the network layer. The header contains the MAC address if the destination device and the trailer has the CRC and other parameters and flags.
The CRC or cyclic redundancy check is a calculation of the frame used to check for correctness at the destination. When the frame gets to the data-link layer of the destination device, it calculates the CRC and compares the result with that of the source. If they are equal, the frame moves on, if not, it is discarded.