You need to design a security solution for the internally developed Web applications that meets business requirements. What should you do？（）

• A、Install and configure a stand-alone root certification authorative （CA） that is trusted by all company client computers. Issue encryption certificates to all developers
• B、Install and configure root certification authority （CA） that is trusted by all company client computers. Issue code-signing certificates to all developers
• C、Purchase a root certification from a trusted commercial certification authority （CA）. Install the root certificated on all developers’ computers
• D、Purchase a code-signing certificate from a trusted commercial certification authority （CA）. Install the certificate on all company client computers