Which of the following statements about virtual devices of virtual machines is correct? (Multiple choice)

Which of the following statements about virtual devices of virtual machines is correct? (Multiple choice)
A . The "custom" working mode of virtual CPU can provide optimal migration compatibility and optimal performance for virtual machines.
B . When the virtual machine uses " virtio hard disk" or " virtio " network card, there is no need to install the virtio device driver.
C . " virtio network card" has better performance than "ordinary network card". It is recommended to use " virtio network card"
D . The virtual CPU of the virtual machine uses physical CPU resources through time slice polling.

Answer: CD