A. public-key infrastructure (PKI)
The system for creating and distributing digital certificates issued by trusted third parties such as DigiCert, GoDaddy, or Sectigo.
The correct answer is A: PKI (Public Key Infrastructure)
The other options are less suitable because:
VLAN tagging (B): This is a networking concept unrelated to certificate-based security
LDAP (C): While LDAP can use certificates, it's primarily a directory service protocol
MFA (D): While certificates can be used in MFA, they are just one of many possible authentication factors
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