Answer Posted / zgeorgem

1. bit stuffing
2. LRC
3. CRC
4. parity check

here 1 2 3 are either error detection or error correction
which can be potentially done by DataLink Layer

But bit stuffing (from wikipedia) seems to be done by the
physical layer so that the data arrives at the device
synchronized... (i am not sure of the working but i am sure
that it is a layer1 concept)

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