What is the maximum data rate of a channel with a bandwidth of 200 kHz if we use four levels of digital signaling?

What is the maximum data rate of a channel with a bandwidth of 200 kHz if we use four levels of digital signaling?

a) 400 Kbps
b) 800 Kbps
c) 1000 Kbps
d) 1200 Kbps

From the Combined Bank Senior Officer September 2021 – Preliminary (AUST) exam, question 19 of 92.

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