[PCI-DSS] 2.2.4 Remove all unnecessary functionality, such as scripts, drivers, features, subsystems, file systems, and unnecessary web servers.
2.2.4 For a sample of system components, verify that all unnecessary functionality (for example, scripts, drivers, features, subsystems, file systems, etc.) is removed. Verify enabled functions are documented and support secure configuration, and that only documented functionality is present on the sampled machines.