Which of the following is used to validate a certificate when it is presented to a user?
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Correct answer: OCSP.
Why this is the answer
OCSP (Online Certificate Status Protocol) is used to validate the revocation status of a digital certificate in real-time when it is presented to a user. This ensures the certificate is still valid and has not been revoked by the Certificate Authority (CA). CSR (Certificate Signing Request) is a request sent to a CA to obtain a certificate, not for validation. CA (Certificate Authority) is the entity that issues and manages certificates, but it doesn't perform the real-time validation itself for a presented certificate. CRC (Cyclic Redundancy Check) is an error-detection code used to check data integrity, not certificate validity.
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