[单项选择] You have a desktop computer and a portable computer.  Both the computers are configured to allow remote desktop connections. You connect to the desktop computer from the portable computer.  You need to save files from within the remote session to the C:// drive of the portable computer.  What should you do？（）
A. On your portable computer， map a drive to the C:// drive of the remote computer.
B. In the System Properties dialog box of the desktop computer， enable the Remote Assistance feature.
C. In the properties of the Remote Desktop Connection application， on the portable computer， select the C:// drive as a local resource for the remote session.
D. In the properties of the Remote Desktop Connection application， on the portable computer， click the Automatically detect TS Gateway server settings option.