At which OSI layer is a source IP address added to a PDU during the encapsulation process?

Question:
At which OSI layer is a source IP address added to a PDU during the encapsulation process?

• network layer
• data link layer
• transport layer
• application layer

Explanation: CSMA/CA stands for carrier sense multiple access with collision avoidance. It is a mechanism used in wireless networks to prevent packet collisions from occurring.

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