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Two ports containing sources in their branches are called?

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Two ports containing sources in their branches are called?

(a) three port

(b) one port

(c) passive ports

(d) active ports

I have been asked this question in quiz.

My doubt is from Open Circuit Impedence(Z) Parameters in division Two-Port Networks of Network Theory

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The correct choice is (d) active ports

To explain: Two ports containing sources in their branches are called active ports. A voltage and current is assigned to each of the two ports.

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