[Solved] are used to overcome the difference in data transfer speeds of various devices.

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Q.	are used to overcome the difference in data transfer speeds of various devices.
A.	speed enhancing circuitory
B.	bridge circuits
C.	multiple buses
D.	buffer registers
Answer» D. buffer registers
Explanation: by using buffer registers, the processor sends the data to the i/o device at the processor speed and the data gets stored in the buffer. after that the data gets sent to or from the buffer to the devices at the device speed.

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