In Order for a CISO to Have True Situational Awareness

In order for a CISO to have true situational awareness there is a need to deploy technology that can give a real-time view of security events across the enterprise. Which tool selection represents the BEST choice to achieve situational awareness?

A) Intrusion Detection System (IDS) , firewall, switch, syslog
B) Security Incident Event Management (SIEM) , IDS, router, syslog
C) VMware, router, switch, firewall, syslog, vulnerability management system (VMS)
D) SIEM, IDS, firewall, VMSSIEM, IDS, firewall, VMS