What is the meaning of a Real Time FFT graph?

What is the meaning of a Real Time FFT graph?
A . Real Time FFT means Real Time First Fundamental Trace and shows the value of the first signal detected on each frequency at each sweep interval.
B . Real Time FFT means Real Time Fast Frequency Timing and shows the RF pulses measured by the Layer 1 sweep tool.
C . Real Time FFT means Real Time Fast Fourier Transform and shows the max value of the signal detected on each frequency in real time.
D . Real Time FFT means Real Time Frequency Fundamental Texture and shows the value of the noise background generated by the card used to perform the
E . Real Time FFT means Real Time Fast Fourier Transform and shows the max value of the signal detected on each frequency in real time.

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Answer: C