A recommended PTF is released to resolve reliability issues with bos .net.tcp.server. A Maintenance windows has been scheduled to install the PTF on all nodes.  In order to complete the maintenance，what are the next logical steps to be completed after the install of the PTF on all nodes？（）

• A、 Test Ethernet fallover and bring all of the resource groups online.
• B、 Upgrade the firmware on all Ethernet adapters and bring all of the resource groups online. 
• C、 Verify all necessary applications and resource groups are functioning properly and test ethernet fallover on all nodes.
• D、 Verify all necessary applications and resource groups are functioning properly and bring all of the resource groups online.