USB ports are a common attack vector that can be used to deliver malware, steal data, or compromise systems.
The first step to mitigate this vulnerability is to check the configurations of the company assets and disable or restrict the USB ports if possible. This will prevent unauthorized devices from being connected and reduce the attack surface. The other options are also important, but they are not the first priority in this scenario.
References:
CompTIA CySA+ CS0-003 Certification Study Guide, page 247
What are Attack Vectors: Definition & Vulnerabilities, section "How to secure attack vectors" Are there any attack vectors for a printer connected through USB in a Windows environment?, answer by user "schroeder"