Huong is the system administrator for a virtual machine that is used by over $500$ employees. She wants to install some device drivers to enable support for a few hardware components. Before she installs the drivers, she wants to ensure that she can revert to the current version of the virtual machine if something goes wrong with the installation.

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Which of the following Hyper$-$V features should Huong use?

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a$.$

Replication

b$.$

Nested virtualization

c$.$

Live migration

d$.$

Checkpoints