+1 vote
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Encode / Decode data for physical transmission is done by which layer of OSI reference model?
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presentation layer
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okay! and also in question, what they are trying to say by physical transmission (i just get confused it with Manchester & differential Manchester encoding).
+1
Use of "physical transmission" focuses on the fact that eventually data is transmitted over wires. Only "transmission" would also solve the purpose of the question.
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presentation layer of OSI reference model

The OSI (Open Systems Interconnection) Reference model has 7 layers. Namely-

• Physical Layer
• Network Layer
• Transport Layer
• Session Layer
• Presentation Layer
• Application Layer

The Presentation Layer providing services that allow communicating applications to interpret the meaning of data exchanged.This services include data compression and as well as data encryption

$\color{green}{\text{Presentation Layer}}$ $\text{will be the answer}.$