A company uses AWS Organizations to host several applications across multiple AWS accounts. Several teams are responsible for building and maintaining the infrastructure of the application across the AWS accounts.
A SysOps administrator must implement a solution to ensure that user accounts and permissions are centrally managed. The solution must be integrated with the company's existing on-premises Active Directory environment. The SysOps administrator already has enabled AWS Single Sign-On (AWS SSO) and has set up an AWS Direct Connect connection.
What is the MOST operationally efficient solution that meets these requirements?

A. Create a Simple AD domain, and establish a forest trust relationship with the on-premises Active Directory domain. Set the Simple AD domain as the identity source for AWS SSO. Create the required role-based permission sets. Assign each group of users to the AWS accounts that the group will manage.
B. Create an Active Directory domain controller on an Amazon EC2 instance that is joined to the on- premises Active Directory domain. Set the Active Directory domain controller as the identity source for AWS SSO. Create the required role-based permission sets. Assign each group of users to the AWS accounts that the group will manage.
C. Create an AD Connector that is associated with the on-premises Active Directory domain. Set the AD Connector as the identity source for AWS SSO. Create the required role-based permission sets. Assign each group of users to the AWS accounts that the group will manage.
D. Use the built-in SSO directory as the identity source for AWS SSO. Copy the users and groups from the on-premises Active Directory domain. Create the required role-based permission sets. Assign each group of users to the AWS accounts that the group will manage.