While you attempt to register Cisco UCS Manager domain with Cisco UCS Central, you find that it is failing. Which three options are possible causes for the failure between the Cisco UCS manager domain and Cisco UCS Central? (Choose threE.
A. Incorrect shared secret
B. Date and time mismatch
C. Version mismatch
D. TCP packet loss
E. Incorrect default policy configured in Cisco UCS central
F. Using the IP address of the Cisco UCS Manager domain instead of the FQDN
ABD is correct
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-central/troubleshooting/Cisco-UCS-Central_Troubleshooting_Reference/Cisco-UCS-Central_Troubleshooting_Reference_chapter_0101.pdf
Agree, ABD is correct.