Regarding the description of virtio, which of the following is incorrect?

Regarding the description of virtio, which of the following is incorrect?
A . Compared with the full simulation setting virtio performance is better,
B . To use the virtio setup, you need to install a special setup driver,
C . The virtio drivers of Fusion Compute are all included in Tools.
D . When I/O is frequent, the server CPU usage is relatively high.

Answer: B