Which of the following statements about x86 architecture virtualization are correct? (Multiple choice)

Which of the following statements about x86 architecture virtualization are correct? (Multiple choice)
A . The original x86 architecture was not suitable for virtualization because sensitive unprivileged instructions could not be captured by the VMM.
B . Full virtualization solution requires modifying the guest OS
C . In the paravirtualization solution, the hypervisor provides a hypercall interface to meet the key kernel operations of the guest os, such as memory management, interrupt time synchronization, etc.
D . The hardware-assisted virtualization solution introduces VMCS (virtual-machine control structure), which saves the relevant status information of the virtual CPU.

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Answer: ACD