In a composite function, If f[g(x)] = x=g[f(x)] then Of(x) and g(x) must be same functions Of(x) and g(x) is not a function

Question

In a composite function, If f[g(x)] = x=g[f(x)] then
Of(x) and g(x) must be same functions
Of(x) and g(x) is not a function
Of(x) and g(x) are inverses
Of(x) and g(x) must be different functions

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