A customer has 15 IBM x365 servers in a rack environment and is using IBM Director for systems management.  They require the ability to restart any server independent of the operating system.  Which of the following is the most cost-effective solution？（）

• A、Interconnect the service processors and use the IBM Director Agent
• B、Install RSA II in each server and chain together the systems management processors
• C、Install the RSA II in the top server and chain together the service processor interconnect
• D、Install the IBM Director Agent on each server and use the remote control function to restart the servers