What is the effect of an iRule error such as referencing an undefined variable?

A BIG-IP Administrator needs to find which modules have been licensed for use on the BIG-IP system. In which section of the Configuration Utility can the BIG-IP Administrator find this information?

An LTM Specialist has detected that a brute force login attack is occurring against the SSH service via a BIG-IP management interface. Login attempts are occurring from many IPs within the internal company network. BIG-IP SSH access restrictions are in place as follows:

The LTM Specialist has determined that SSH access should only occur from the 192.168.1.0/24 and
172.16.254.0/23 networks.
Whichtmsh command should the LTM Specialist use to permit access from the desired networks only?

An LTM Specialist reports that an application si no longer reachable after it has beenupgraded.
Nothing has been changed in the configuration on the LTM device.
The logs indicates that health monitors to all servers have failed as shown:
What should the LTM Specialist verify next?

Which method is recommended for creating a new user from the CLI?