Which security services do digital signatures provide?

A.
Confidentiality and availability

B.
Integrity and accountability

C.
Integrity and accessibility

D.
Confidentiality and integrity

Explanation:
Digital signatures are created by using a hashing algorithm to create
a message digest & then a private key is used to encrypt the message digest.
Integrity is provided by using the hashing algorithm, because the receiver will
create another message digest value & compare it with the one that was sent. It
provides authentication because when the receiver decrypts the message digest value
with the sender’s public key she is sure who sent it. Digital signatures provide
non-repudiation.