When optimizing a standalone point-to-multipoint bridge installation with eight non-root bridges，which of the following RTS threshold and CWmin settings would be correct for the non-root bridges？（）

• A、RTS threshold = 4000， CWmin = 3
• B、RTS threshold = 1， CWmin = 4
• C、RTS threshold = 4000， CWmin = 5
• D、RTS threshold = 1， CWmin = 5