With KVM, when using VNC as graphical output, how can the absolute positioning of the mouse pointer be assured?

With KVM, when using VNC as graphical output, how can the absolute positioning of the mouse pointer be assured?

A.
It cannot be assured. There are always two mouse pointers in VNC; the real pointer and the virtual pointer.

B.
Using the mouse absolute option

C.
No additional option is required; this works out of the box.

D.
Using the usb usbdevice tablet options

E.
Using the vnc altgrab options