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The Internal Bus does not communicate with external periferal devices or it would cease to be an Internal Bus.
The only other arrow leaving the block diagram to connect with the outside world is the Memory and I/O Bus, so that's the Bus that connects with (external) periperals and Answer B. is the right answer. Also I/O stands for Input/Output.
Answer A. is wrong because the ALU - Arithmetic Logic Unit handles arithmetic and not connections to periperals.
Answer C. is wrong because the Control Unit synchronizes the functioning of the microprocessor's components but doesn't handle communications.
Answer D. is wrong because a bus, whether internal or external, can't handle communications between more than 2 units (the sender and the receiver) at the same time.
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Answer A. is the right answer because the ALU - Arithmetic Logic Unit handles arithmetic and not connections to periperals.
Answer B. is wrong because the ALU - Arithmetic Logic Unit handles arithmetic and does dereference memory addresses.
Answer C. is wrong because General Registers don't handle arithmetic.
Answer D. is wrong because the Control Unit synchronizes the tasks of the microprocessors different components.
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A purely resistive load equal to the transmission line's impedance is required to terminate all transmission lines in order to keep power from being reflected back to the sender and either heat and destroy the active component in a transmitter or smudge in the time domain the signal received by the receiver, or by a an IC - Integrated Circuit on a PCB - Printed-Circuit Board.
Answer B. is thus the right answer.
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For safet reasons the anode of a Magnetron is grounded thus the cathode and filament carry a very high voltage and Answer C. is the right answer.
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