Q 2683856747.     A function `f(x)` satisfies the relation `f(x + y) = f(x) + f(y) + xy (X+ y) AA x, y in R` If `f'(0) = -1`, then

(This question may have multiple correct answers)

A `f(x)` is a polynomial function
B `f(x)` is an exponential function
C `f(x)` is twice differentiable for all `x in R`
D `f' (3) = 8`
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