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Who developed the first US cellular telephone system called AMPS?

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Who developed the first US cellular telephone system called AMPS?

(a) Motorola

(b) Ericsson

(c) AT & T Bell Laboratories

(d) ETSI

This question was addressed to me in unit test.

My question comes from AMPS and ETACS topic in portion Wireless Systems and Standards of Wireless/Mobile

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The correct answer is (c) AT & T Bell Laboratories

Best explanation: In the late 1970s, AT & T Bell Laboratories developed the first US cellular telephone system called the Advanced Mobile Phone System (AMPS). In 1983, a total of 40 MHz of spectrum in the 800 MHz band was located by the Federal Communication Commission for AMPS.

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