For the function, (a) determine whether it is one-to-one and (b) if it is one-to-one, find a formula for the inverse.f(x) = 2/7x+4Find the formula for f?¹(x), the inverse of f(x) = 2/7x+4 if it exists. Select the correct choice below and, if necessary, fill in any answer boxes within your choice.A. The function is one-to-one and f?¹(x) = ?.(Simplify your answer. Use integers or fractions for any numbers in the expression.)B. The function is not one-to-one and there is no inverse function.