Which of the following is not a concept that belongs to the security management?

Question $16$Select one:

a$.$

An electronic signature using a cryptographic private key from a user$$s certificate, authenticating a user in message transmissions or approvers in business workflow processes.

b$.$

Revoking permissions from a group of people.

c$.$

The verification of the genuinity of the content.

d$.$

Giving permissions to a group of people.