What must a router do before it can look up a route in its routing table

a$-$ Remove the packet header to decapsulate the layer $3$ addresses.

b$-$ Perform a logical AND using the destination IP address and the subnet mask.

c$-$ Perform a logical AND using the source IP address and the destination IP address.

d$-$ Perform a logical AND using the source IP address and the subnet mask.

e$-$ Convert the IP addresses from decimal to binary.