The recommended and supported method for creating BIG-IP users from the CLI is through TMSH , using the authentication subsystem.
tmsh create auth user < username > prompt-for-password:
Properly creates the user within BIG-IP’s AAA/authentication framework
Encrypts the password securely
Ensures the user is stored and managed correctly in the BIG-IP configuration database
Is fully supported and documented
Why the other options are incorrect:
B is unsafe and unsupported because editing bigip.conf directly and storing clear-text passwords violates security and configuration management best practices.
C (f5adduser / f5passwd) is deprecated and not recommended for modern BIG-IP versions.
D creates a Linux system user only , not a BIG-IP administrative user, and will not allow access to the Configuration Utility or TMSH roles.
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