Please match the Cisco NAC appliance component to its description.()
	(1)Cisco NAS
	(2)Cisco NAA
	(3)Rule-set Lpdates
	(4)Cisco NAM
	(a) a centralized management point
	(b) an in-band cr out-of-band device for network access control
	(c) a Windows-based client which allows network access based on the tasks running
	(d) a status crecker for operating systems,antivirus,antispyware,etc.