For f(x) =x/x-7 and g(x) = -6/x, find the following composite functions and state the domain of each.O A. The domain of fog is {x(Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)B. The domain of f o g is all real numbers.(a) fogXX-7(a) (fog)(x) =and g(x)=(b) gof7x+6X(c) fof(d) gog(Simplify your answer.)Select the correct choice below and, if necessary, fill in the answer box within your choice.*****