When configuringan IM and Presence server on the Expressway-C or VCS-C, which role must the user have for connecting to the IM and Presence server?
A. Standard CTI Enabled
B. Standard Serviceability Administration
C. Standard AXL API Access
D. Standard CCM Admin Users
I agree with C
https://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/X8-1/Mobile-Remote-Access-via-VCS-Deployment-Guide-X8-1-1.pdf
Check page 16 about the roles