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What is the definition of a primary instrument?

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Norton's Theorem is a way to reduce a network to 

(A) An equivalent circuit composed of a single current source, series resistance, and series load (B) An equivalent circuit composed of a single voltage source, parallel resistance, and parallel load (C) An equivalent circuit composed of a single voltage source, series resistance, and series load (D) An equivalent circuit composed of a single current source, parallel resistance, and parallel load 

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