Your company needs an inexpensive solution to host their AD data in the cloud. They do not need all of the features of AD but do need to be able to use it with WorkSpaces. What is the best solution from the below that can be used

Answer options:

A.Deploy an AD server on an M3.large instance
B.Use the Hosted Microsoft AD solution
C.Use the Simple AD solution
D.Consider using the AD Connector

Answer – C
Simple AD is the least expensive with the required feature set to work with AWS Workspaces
Amazon WorkSpaces uses directories to store and manage information for your WorkSpaces and users. For your directory, you can choose from Simple AD, AD Connector, or AWS Directory Service for Microsoft Active Directory (Enterprise Edition), also known as Microsoft AD. In addition, you can establish a trust relationship between your Microsoft AD directory and your on-premises domain.
For more information on Workspaces and Simple AD , please refer to the below link:
http://docs.aws.amazon.com/workspaces/latest/adminguide/launch-workspace-simple-ad.html