A technician states that workstations that are on the network in location B are unable to validate certificates, while workstations that are on the main location A's network are having no issues…

XACML (eXtensible Access Control Markup Language) is a policy language for authorization decisions and plays no role in certificate revocation or validation.

OCSP (Online Certificate Status Protocol) enables a client to send a targeted query to a single OCSP responder server and receive a signed response indicating whether a specific certificate is valid, revoked, or unknown. Unlike CRLs, OCSP does not require the client to download and parse an entire revocation list, making it functional even when CRL distribution points are unreachable. This makes OCSP the correct answer for a scenario where a single server returns the validity of a certificate on demand.

ACL (Access Control List) is a mechanism for controlling access to network or file system resources, not for checking the revocation status of digital certificates.

CRL (Certificate Revocation List) is a downloaded list that clients check locally, not a real-time single-server query mechanism, and its distribution point may be inaccessible from location B.