If f (x) = 5x-25 and g (x) = 1/5x+5, which expression could be used to verify g (x) is the inverse of f (x) ?

a) 1/5 (1/5x) + 5

b) 1/5 (5x-25) + 5

c) (1/5x+5)

d) 5 (1/5x+5) + 5

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