Which of the following best describes Flexgrid?

Which of the following best describes Flexgrid?
A . Flexgrid is based on flexible amplification stages
B . Flexgrid uses flexible guardband that can take any spacing.
C . Flexgrid is defined on a frequency grid spacing based on ,multiples of 12.5 GHz.
D . Flexgrid allows channel bandwidth central frequencies and guardband to take any value in the spectrum range.

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Answer: A