A Current Trend in I/O Device Technology and I/O Subsystem

Multiple Choice

A current trend in I/O device technology and I/O subsystem is

A) there is an increasingly broad variety of I/O devices.
B) new devices are similar to the previous I/O devices that makes it easier to incorporate them in operating systems.
C) to encapsulate the oddities of different I/O devices, the device drivers present device-specific interface for each device to the I/O subsystem.
D) All of the above.