In Microsoft's identity platform, Active Directory Domain Services (AD DS) is the on-premises directory that maintains directory objects such as users, groups, and computers. Microsoft documentation describes AD DS as a service that "stores information about objects on the network and makes this information easy for administrators and users to find and use." It further explains that AD DS contains objects like "users, groups, computers, and other resources," and that administrators use tools such as Active Directory Users and Computers to create and manage these objects. A key object type is the computer account; Microsoft states that "a computer that's joined to a domain has a corresponding computer account object in Active Directory" and that these accounts are created and managed within AD DS to enable secure authentication and authorization for domain-joined devices.
By contrast, mobile devices are typically enrolled and managed through Microsoft Intune/Endpoint Manager and Azure AD device objects, not created in AD DS. Likewise, SaaS applications that require modern authentication integrate with Microsoft Entra ID (Azure AD) using OpenID Connect/OAuth 2.0-not with AD DS. Line-of-business apps that rely on modern authentication are also registered in Entra ID, while AD DS supports traditional Kerberos/NTLM for domain resources. Therefore, among the options provided, the object you can create in AD DS is computer accounts.