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What is the typical bandwidth of a 2-wire telephone line?

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What is the typical bandwidth of a 2-wire telephone line?

(a) 20 Hz to 6 KHz

(b) 300 Hz to 3.4 KHz

(c) 20 Hz to 20 KHz

(d) 200 Hz to 6.5 KHz

I got this question in an international level competition.

My question is based upon Problems of DSBSC topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct option is (b) 300 Hz to 3.4 KHz

Explanation: A helical antenna is an antenna made of one or more conducting wires wound in the form of a helix. It produces circular polarization, because of which it is highly used in radio telemetry. It is mainly used for satellite tracking due to its good front to back ratio.

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