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If bandwidth is of primary concern, which one of the following scheme is generally not considered?

If bandwidth is of primary concern, which one of the following scheme is generally not considered? Correct Answer FSK

If Rb is the bit rate, then:

For ASK: BWASK = 2Rb

For PSK: BWPSK = 2Rb

For FSK: BWFSK  = 2 Rb + |f1 - f2|

f1 and f2 are the two lower and upper frequencies.

Observation:

BWASK = BWPSK < BWFSK

Hence compared to ASK and PSK, FSK requires a large bandwidth.

Note: 

The probability of error is maximum in ASK.

Hence PSK is the most widely used.

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