Correct Answer: B
Solution :[b] It was in 1962 that the first commercial modem, the bell 103, was released by AT&T. Bell 103 was also the first modem with full-duplex transmission frequency-shift keying or FSK and had a speed of 300 bits. Per second or 300 bauds. Be 103 was followed by Bell 212, which reached speeds of 1200 bits per second.
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