152. Referring to the sound-powered telephone circuit shown in the illustration, what statement is true

The sound-powered telephone circuitry consists of common-talk and common-ringing circuits.
The sound-powered telephone circuitry consists of selective-talk and selective-ringing circuits.
The sound-powered telephone circuitry consists of a common-talk circuit and a selective-ringing circuit.
The sound-powered telephone circuitry consists of a selective-talk circuit and a common-ringing circuit.

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