Which Cisco platform ensures that machines that connect to organizational networks have the recommended antivirus definitions and patches to help prevent an organizational malware outbreak?

Cisco WiSM (Wireless Services Module) is a wireless LAN controller module that manages wireless access points, not a security platform for endpoint posture assessment.

Cisco Secure Email Gateway (formerly ESA) protects email communications from threats like spam and malware, but it does not perform endpoint posture assessment for network access.

Cisco Identity Services Engine (ISE) is a Network Access Control (NAC) platform that enforces security policies by performing a posture assessment of devices connecting to the network. It ensures that devices meet compliance requirements, such as having up-to-date antivirus definitions and patches, before granting or restricting network access, thereby helping to prevent malware outbreaks.

Cisco Prime Infrastructure is a network management system for monitoring and configuring network devices, but it does not directly enforce endpoint security posture for access control.