A one-way hash provides which of the following?

A.
Confidentiality

B.
Availability

C.
Integrity

D.
Authentication

Explanation:
The verification of message integrity is an important application of secure hashes.
Incorrect Answers:
A, D: A hash function provides Integrity, not confidentiality or authentication.
B: A hash function provides Integrity, not availability.

https://en.wikipedia.org/wiki/Cryptographic_hash_function
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 825