When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does it replace?

When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does it replace?
A. Layer 4 protocol
B. Layer 3 IP address
C. Layer 2 frame header and trailer
D. Layer 5 session

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