Use the graphs of the functions to solve the problem f x x 3 g x 6 a f x g x b f x g x c f x g x 12 Tex 6 to co 6 12 compound inequality O D The solution set is the empty set c Solve f x g x Select the correct choice below and if necessary fill in the answer box to complete your answer OA The solution set is x Simplify your answer Type a compound inequality OB The solution set is Simplify your answer Use a comma to separate answers as needed OC The solution set is x x or x Simplify your answer Type inequalities OD The solution set is the empty set