Which of the Following Describes the 2N Model for VM

Multiple Choice

Which of the following describes the 2N model for VM redundancy?

A) There is one active VM and one standby VM that takes over if the active VM fails.
B) Thera are N active VMs and a pool of standby VMs that can take over if one or more active VMs fail.
C) There are N active VMs, each one paired with a standby VM that takes over if its active VM fails.
D) There are 2N active VMs deployed to support a service that needs N active VMs, with extra capacity in case one or more VMs fail.