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The correct answer is B.

OBJ-2.1: Network Access Control (NAC) is an approach to computer security that attempts to unify endpoint security technology (such as anti-virus, host intrusion prevention, and vulnerability assessment), user or system authentication, and network security enforcement. When a remote workstation connects to the network, NAC will place it into a segmented portion of the network (sandbox), scan it for malware and validate its security controls, and then based on the results of those scans, either connect it to the company’s networks or place the workstation into a separate quarantined portion of the network for further remediation. An access control list (ACL) is a network traffic filter that can control incoming or outgoing traffic. An ACL alone would not have prevented this issue. MAC Filtering refers to a security access control method whereby the MAC address assigned to each network card is used to determine access to the network. MAC filtering operates at layer 2 and is easy to bypass. Sender Policy Framework (SPF) is an email authentication method designed to detect forging sender addresses during email delivery.

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