What does the number in the various Quadrature Amplitude Modulation levels, such as 16 in QAM-16 and 64 in QAM-64, indicate? (Choose the single best answer.)

What does the number in the various Quadrature Amplitude Modulation levels, such as 16 in QAM-16 and 64 in QAM-64, indicate? (Choose the single best answer.)
A . The speed of data transfer, which is four times the number in the QAM level
B . The channel width, which is stipulated in MHz
C . The number of target points in the QAM constellation, which are equivalent to amplitude and phase combinations
D . The number of spatial streams, which is 1/4 the number in the QAM level

Answer: C

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