This is the question.

2 Find all real numbers that satisfy the equation cos [ Use the smallest nonnegative arcs for the solution set. Select the correct choice below, and if necessary, ll in the answer box(es) to complete your choice. O A The solution set is {x Ix = +4kzr}, where k is any integer. ' (Use integers or fractions for any numbers in the expression. Use ascending order. Type an exact answer, using 7: as needed.) 0 B The solution set is {x Ix = _ + 2km: or x =D+ 2km}, where k is any integer. ' (Use integers or fractions for any numbers in the expression. Use ascending order. Type an exact answer, using 1: as needed.) 0 C The solution set is {x Ix = + 2k1r}, where k is any integer. ' (Use integers or fractions for any numbers in the expression. Use ascending order. Type an exact answer, using 1|: as needed.) 0 D The solution set is {x Ix = +4kzi: or x = + 4km}, where k is any integer. (Use integers or fractions for any numbers in the expression. Use ascending order. Type an exact answer, using 7: as needed.) 0 E. There is no solution