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Option 2 : Source address
A router will not change the source address of the packet, rest of the given fields can be changed at the router.
Checksum: Checksum field changes at every router in correspondence with the change in values of other fields.
TTL (Time to Live): After every hop, the TTL field is reduced by one. Hence this field changes at every router.
Length: If fragment - apian is required length field will certainly change.
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