Which of these is a benefit of using Network Admission Control instead of Cisco Identity Based Networking Services？（）

• A、 NAC can authenticate using 802.1X and IBNS cannot
• B、 NAC can ensure only compliant machines connect and IBNS cannot
• C、 NAC can ensure access to the correct network resources and IBNS cannot
• D、 NAC can manage user mobility and reduce overhead costs and IBNS cannot