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