Which of the following statements describes the concept behind paravirtualization?

Which of the following statements describes the concept behind paravirtualization?
A . Guest operating systems are modified to actively cooperate with the hypervisor in order to ease virtualization costs and gain better performance.
B . Instead of running full virtual machines, containers are used to separate distinct parts of one commonly shared operating system that appear as a virtual machine.
C . To avoid the need for virtualization, special security measures are taken to allow different applications to coexist on one physical machine.
D . Each operating system is trusted to use only those resources assigned to it, thereby eliminating the need of an additional virtualization layer.

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Answer: A