Difference between Client server failure and Global server failure

Hi Experts,
If someone asks what’s the difference between client failure server failure and global server failure what can be the answers for sip fail cause?

4XX Codes (Client Failure): The request contains bad syntax or cannot be fulfilled at the server e.g. 401 Unauthorized, 403 Forbidden.

5XX (Codes Server Failure): The server failed to fulfill an apparently valid request e.g. 500 Server Internal Error, 504 Server Time-out.

6XX (Global Failure): The request cannot be fulfilled at any server e.g. 600 Busy Everywhere, 604 Does Not Exist Anywhere.

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