For f(x)=?x and g(x) = 4x + 1, find the following composite functions and state the domain of each.(a) fog(b) gof(c) fof(d) gogOB. The domain of g of is all real numbers.(c) (fof)(x)=????x (Simplify your answer.)Select the correct choice below and fill in any answer boxes within your choice.A.The domain of fofis xx(Type an inequality. Simplify your answer. Use integers or fractions for any numbers in the expression.)OB. The domain of fo f is all real numbers.(d) (gog)(x) = (Simplify your answer.)Select the correct choice below and fill in any answer boxes within your choice.O A. The domain of g og is {x}.(Type an inequality. Simplify your answer. Use integers or fractions for any numbers in the expression.)OB. The domain of g og is all real numbers.