CompTIA Exam Questions

Which of the following is this an example of?

A company has implemented a public-facing authentication system that uses PKI and extended attributes to allow third-party, web-based application integration.
Which of the following is this an example of? (Select THREE).

A.
Federation

B.
Two-factor authentication

C.
Transitive trust

D.
Trusted OS

E.
Single sign-on

F.
TOTP

G.
MAC