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The encoding technique used to transmit the signal in giga ethernet technology over  fiber optic medium is

  1. Differential Manchester encoding
  2. Non return to zero
  3. $\text{4B/5B}$ encoding
  4. $\text{8B/10B}$ encoding

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$8B/10B$ encoding technique used to transmit the signal in giga ethernet technology over  fiber optic medium.

This layer describes the byte synchronization and the encode/decode scheme which transmits 8 bits as a 10-bit code group. The features of this scheme are low-cost component design and good transition density for easy clock recovery.

Check GIGABIT ETHERNET here.

So D is correct option.

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for gigabit ethernet  encoding technique used is 8B/10B  and for standard ethernet it is manchester encoding
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