Solve the equation for exact solutions over the interval [0, 2x). 4 sin 2x+8 sin x+4=0 Select the correct choice below and, if necessary, fill, in the answer box to complete your choice. OA. The solution set is {} (Type an exact answer, using x as needed. Type your answer in radians. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed) B. The solution is the empty set.