Correct Answer: B, C, DTo configure a TLS link between Communication Manager (CM) and Session Manager (SM) using Identity certificates signed by Avaya Aura System Manager (SMGR) Certificate Authority (CA), several steps must be carried out. First, the CA certificate should be uploaded to CM, which can be done via the Miscellaneous/Download files option on the System Management Interface (SMI) screen. Next, a PEM file should be downloaded from Avaya Aura System Manager (SMGR) to obtain the necessary certificate information. Finally, the CA certificate needs to be added to CM using the Security/Trusted Certificates option to ensure the trust relationship is established for the TLS signal link. These steps ensure that the certificates required for the secure link are correctly uploaded and trusted on CM, enabling the signaling link to come into service.