Final answer:
The remediation practice in question is patching, a critical component of cybersecurity that addresses vulnerabilities to protect systems against exploitation.
Step-by-step explanation:
The remediation practice that the system admin is reviewing is likely C. Patching. Patching is critical in maintaining the security of systems and applications, as it involves updating software to address discovered vulnerabilities. Failure to patch systems can leave them susceptible to cyberattacks that exploit these weaknesses. Unlike compensating controls or segmentation that add additional layers or divisions of security, and exceptions and exemptions that may reduce security by bypassing controls, patching directly addresses and corrects the vulnerabilities, ensuring the systems are protected against known threats.