What is the formula for selecting a feasible successor?
- The RD of the feasible successor route is less than the FD of the current successor route.
- The RD of the current successor route is less than the FD of the feasible successor route.
- The FD of the feasible successor route is less than the RD of the current successor route.
- The FD of the current successor route is less than the RD of the feasible successor route.
Explanation: To be considered a feasible successor, a backup route must satisfy the feasibility condition, which states that its Reported Distance (RD) must be strictly lower than the Feasible Distance (FD) of the current successor route. This ensures the backup path is not part of a routing loop.
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