All client computers on your company network run Windows 7 and are members of an Active Directory Domain Services domain. Employees using portable computers report that they get connected to a coffee shop wireless network from the company conference room. You need to ensure that the employees connect to the company wireless network by default from anywhere within the company premises. What should you do?（）

A. Configure the Network authentication (Shared mode) setting.
B. Apply a Wireless Network Policy to set the network type to WPA-PS
C. Apply a Wireless Network Policy to automatically connect to the company wireless network.
D. Apply a Wireless Network Policy to set the company wireless network as the preferred network.