启用SYN攻击保护,可提高系统安全性,相应的windowns注册表项为()
A.HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices 下SynAttackProtect键值 B.HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices下TcpMaxPortsExhausted键值 C.HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices下键值TcpMaxHalfOpen D.HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices