6 The function f(x) = is one-to-one. 5+X (a) Find its inverse and check your answer. (b) Find the domain and the range of f and f 6 (a) f1(x) = 5 (Simplify your answer.) X (b) Find the domain of f. Select the correct choice below and, if necessary, fill in the answer box to complete y choice. OA. The domain is {x|x (Type integers or fractions. Use a comma to separate answers as needed.) OB. The domain is {x|x (Type integers or fractions. Use a comma to separate answers as needed.) OC. The domain is {xlx# (Type integers or fractions. Use a comma to separate answers as needed.) D. The domain is the set of all real numbers.