The Chief Information Security Officer (CISO) Is Asking for Ways

The Chief Information Security Officer (CISO) is asking for ways to protect against zero-day exploits. The CISO is concerned that an unrecognized threat could compromise corporate data and result in regulatory fines as well as poor corporate publicity. The network is mostly flat, with split staff/guest wireless functionality. Which of the following equipment MUST be deployed to guard against unknown threats?

A) Cloud-based antivirus solution, running as local admin, with push technology for definition updates
B) Implementation of an off-site datacenter hosting all company data, as well as deployment of VDI for all client computing needs
C) Host-based heuristic IPS, segregated on a management VLAN, with direct control of the perimeter firewall ACLs
D) Behavior-based IPS with a communication link to a cloud-based vulnerability and threat feed