The table below represents the function f.
chart:
x l 3 l 4 l 5 l 7 l 8 l
f (x) l 7 l 15 l 31 l 127 l 255 l
the equation that represents this function is
A. F (x) = 3^x
B. F (x) = 3x
C. F (x) = 2^x-1
D. F (x) = 2x+1
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