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Q.

For carrying digital data over long distance using either analog signal or digital signal at approximately spaced points, we must have

A amplifiers
B repeater
C switch
D either amplifier or repeater
Answer & Explanation
Option: [D]

In case of long distance transmission we use amplifier or repeater. An amplifier enhances the strength of input signal. On the otherhand repeaters receives a signal and retransmits the same signal after increasing the power.

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