Final answer:
The command 'execute router clear bgp' can be used to reset BGP peers or clear the BGP routing table depending on the context and additional specified options. It does not clear all configurations or start a diagnostic process.
Step-by-step explanation:
The command execute router clear bgp is used to reset specific aspects of the Border Gateway Protocol (BGP) state on a router without having to reboot the device or reset all BGP sessions. The exact effects of this command can vary depending on the routing device's operating system and the additional options specified with the command, but commonly, it is used to:
- Reset BGP peers/sessions (clear BGP neighbors)
- Clear the BGP routing tables (reset BGP routing tables)
- Invalidate or refresh certain BGP states or policies
Therefore, in response to the student's question, option b) Resets BGP routing tables and option c) Clears BGP neighbors could both be considered correct depending on the context and the specific syntax and options that follow the basic command. However, it does not clear all BGP configurations or initiate a BGP diagnostic process.