The suggested answer is C.
http://blogs.msdn.com/b/rds/archive/2009/06/08/introducing-remoteapp-and-desktop-connections.aspx
The RemoteApp and Desktop Connections feature offers several benefits:
RemoteApp programs launch from the Start menu just like any other application.
Published Remote Desktop connections are included alongside RemoteApp programs on the Start menu.
Changes to the published connection (such as newly published RemoteApp programs) are automatically reflected on the user's Start menu, without any effort on the user's part.
RemoteApp programs can be easily launched with Windows Search.
Users only have to log on once, to create the connection. From that point on, updates happen with no prompt for user credentials.
RemoteApp and Desktop Connections does not require domain membership for client computers.
RemoteApp and Desktop Connections benefits from new features in Windows Server 2008 R2, such as Personal Desktop assignment or per-user application filtering.
RemoteApp and Desktop Connections is built on standard technologies such as XML and HTTPS, making it possible for developers to build solutions around it. It also offers APIs that allow the client software to support other types of resources, in addition to RemoteApp programs and Remote Desktop connections.