Which of the following choices is most likely to cause obstacles in vulnerability remediation?

Not meeting an SLA is a consequence or indicator of remediation challenges, not an obstacle itself; it reflects a failure in the remediation process or underlying systems.

Patch prioritization is a necessary process to effectively manage and focus remediation efforts on the most critical vulnerabilities, rather than an obstacle to remediation itself.

Organizational governance provides the framework, policies, and structure for how remediation should be conducted; while poor governance can be an obstacle, governance itself is intended to facilitate structured operations.

Proprietary systems often have limited or no official support for patching, may require vendor-specific updates that are infrequent, or involve complex, tightly coupled components that make applying patches or changes risky and difficult without breaking functionality or warranties.