What provides device monitoring when integrating Cisco UACA and Cisco UCM?

This option is the correct protocol that provides device monitoring when integrating Cisco UACA and Cisco UCM. CTI/TAPI stands for Computer Telephony Integration/Telephony Application Programming Interface, and it allows Cisco UACA to monitor and control the devices registered to Cisco UCM. CTI/TAPI is also used for call control, call park, call pickup, and other features on Cisco UACA. References:

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucmac/cuaca/12_0_3/admin_guide/CUACA_AG_120301.pdf

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmfeat/CUCM_BK_F3AC1C0F_00_cucm-features-services-guide-100/CUCM_BK_F3AC1C0F_00_cucm-features-and-services-guide_chapter_010010.html