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
Public Key Infrastructure (PKI) is the set of technology and processes required to secure environments with high assurance to control access to systems
A. public-key infrastructure (PKI)
The system for creating and distributing digital certificates issued by trusted third parties such as DigiCert, GoDaddy, or Sectigo.
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