Which AWS service provides directory options for Microsoft AD and LDAP applications?

AWS Directory Service is the correct choice as it offers a variety of directory services tailored for different needs, including Microsoft Active Directory (AD) and Lightweight Directory Access Protocol (LDAP) applications. This service simplifies the process of setting up and managing directories in the AWS cloud.

With AWS Directory Service, organizations can establish a fully managed Microsoft AD in the cloud, integrate with existing on-premises directories, and connect resources in AWS to their AD. It also supports a range of use cases involving LDAP, making it versatile for application requirements that utilize directory-based authentication and authorization.

The other options do not possess the comprehensive capabilities required for managing Microsoft AD and LDAP applications as effectively as AWS Directory Service does. Options stating 'Simple Directory Service' and 'Active Directory Enterprise' do not denote recognized AWS services relevant to directory management, while 'AWS Identity Store' lacks the specialized functionalities that AWS Directory Service provides.