They are trying to tell you thatCryptography supports all of the core principles of information security . The author has already made up his mind about the questions as you can see. thatCryptography supports all of the core principles of information security . which are AIC triad Authenticity is not part of it.
I guess Availability is not supported by cryptography. Authenticity can be supported as private key can ensure Authentication. Digital Certificate also does confidentiality and it uses PKI