Difference between Client server failure and Global server failure

CORE
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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?

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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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