Exam NCP-MCI-7.5 Topic 1 Question 25 Discussion

Nutanix documentation for Active Directory authentication in Prism Element states that the default LDAP port is 389, while port 636 is used for LDAPS, which provides encrypted LDAP traffic. Because the question explicitly says the administrator wants all traffic encrypted, the correct port is 636. That is the standard LDAPS answer and the one Nutanix documents directly.
The missing exhibit is not actually necessary to answer the question because the encryption requirement itself is enough. Ports 443 and 9440 are associated with web interfaces or management access, not LDAP directory authentication transport. Port 389 is unencrypted LDAP unless other mechanisms are layered on top. Nutanix' s own directory-authentication docs make the intended answer clear: use LDAPS on port 636. Therefore C is the authentic Nutanix answer.