Windows Management Instrumentation (WMI) is a protocol that allows remote management and monitoring of Windows systems. It is used by AD Query to connect to the Active Directory Domain Controllers and query them for user and computer information. AD Query uses WMI to get real-time updates on user logon events, group membership changes, and computer status changes. WMI is not the same as LDAP, which is a protocol for accessing and modifying directory services. HTTPS and RDP are also different protocols that are not used by AD Query. Reference: Check Point R81 Identity Awareness Administration Guide, page 17

A Distinguished Name (DN) is a unique identifier for an object in an LDAP directory, such as a user, a group, or an organization. A DN consists of a sequence of relative distinguished names (RDNs), which are attributes that describe the object. The most common RDNs are:
Common Name (CN): The name of the object, such as a user's full name or a group's name Country : The two-letter ISO code of the country where the object is located, such as US or PK User container (UC): The name of the container that holds the user objects, such as Users or People Domain Component (DC): The name of the domain that the object belongs to, such as checkpoint.com or example.org An Organizational Unit (OU) is not a component of a DN, but a type of object that can be used to organize other objects in a hierarchical structure. An OU can have its own DN, which includes the OU attribute as an RDN, such as OU=Sales,DC=checkpoint,DC=com.
The references are:
Check Point R81 Identity Awareness Administration Guide, page 14
LDAP Distinguished Names
What is a Distinguished Name?

Explanation
Certificate Authority (CA) is a service that issues and manages digital certificates for secure communication between Check Point components. CA can be installed on a Security Management Server or on a dedicated server. CA can be configured as primary or secondary in a High Availability cluster. The cpconfig command is used to run the Check Point Configuration Tool on Gaia OS, which allows users to configure various settings for Check Point products. One of the configuration options is Certificate Authority, which shows if CA is installed on the server and if it is primary or secondary5. Therefore, Alice needs to look for this option to check the CA status.
References: 5: cpconfig