The heads of a hard disk drive touch the surface of the platter to read or write the data

When an event takes place, the control responsible for the event creates an event __________.

a. source b. object c. handler d. firing

The unified device model ________.

a) enables the kernel to use device classes to determine the bus to which a device is attached b) organizes a systems’ devices, device classes, device drivers and buses hierarchically c) was required to implement Plug and Play d) Both a and c.