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The number of function f:[0,1] to [0,1]...

The number of function `f:[0,1] to [0,1]" satisfying " |f(x)-f(x)|=|x-y| " for all "x, y " in " [0,1] is`

A

exactly 1

B

exactly 2

C

more than 2, but finite

D

infinite

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