In which situation（s） will Windows XP advise the technician installing a device that the driver is signed or not？（）

A.in all cases

B.for some non PnP（non plug and play） device drivers and all PnP（plug and play） device drivers

C.for all non PnP（non plug and play） device drivers and most PnP（plug and play） device drivers

D.not for any non PnP（non plug and play）device drivers,only for all PnP（plug and play） device drivers