What is a valid combination of primary and secondary layers of authentication to a company’s two-factor authentication policy?

What is a valid combination of primary and secondary layers of authentication to a company’s two-factor authentication policy?
A . RSA SecurID Authentication (in PVWA) and LDAP Authentication
B . CyberArk Authentication and RADIUS Authentication
C . Oracle SSO (in PVWA) and SAML Authentication
D . LDAP Authentication and RADIUS Authentication

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Answer: A