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 = 1，cwmin = 4
• B、rts threshold = 4000，cwmin = 5
• C、rts threshold = 4000，cwmin = 3
• D、rts threshold = 1，cwmin = 5