Answer - B
The AWS documentation mentions the following
· The primary network interface provides connectivity to the resources within your VPC as well as the Internet, and is used to join the WorkSpace to the directory.
· The management network interface is connected to a secure Amazon WorkSpaces management network. It is used for interactive streaming of the WorkSpace desktop to Amazon WorkSpaces clients, and to allow Amazon WorkSpaces to manage the WorkSpace.
For more information on Amazon Workspaces port requirements, please refer to the below URL:
http://docs.aws.amazon.com/workspaces/latest/adminguide/workspaces-port-requirements.html