Which of the following should the administrator use to BEST secure the VM from attacks against vulnerable services regardless of operating system?

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A cloud administrator is securing an application hosted by an IaaS provider. The operating system on the VM has been updated.

Which of the following should the administrator use to BEST secure the VM from attacks against vulnerable services regardless of operating system?
A . Firewall
B . Antivirus
C . Intrusion detection
D . Patch management

Answer: C