Which of the following is NOT a function of a Certification Authority?

A Certification Authority (CA) plays a crucial role in the public key infrastructure (PKI) by performing several key functions related to digital certificates. Among its responsibilities, the CA issues digital certificates, verifies identities and credentials, and provides cryptographic keys.

The issuance of digital certificates allows entities to authenticate their identities electronically, while the CA also verifies the identity of these entities to safeguard trust in online transactions. The cryptographic keys are part of the certificates provided, enabling secure communication.

Maintaining cloud service controls, however, falls outside the traditional scope of a Certification Authority. This responsibility typically pertains to cloud service providers and encompasses ensuring security measures, compliance with regulations, and overall governance of cloud environments. As such, option C is correctly identified as not being a function of a Certification Authority.