12). Use the square root property to solve the equation: m2−15=0

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A. The solution set is {_________}.

Or

B. The solution is ∅.

(Simplify your answer. Use integers or fractions for any numbers in the expression. Type an exact answer, using radicals as needed. Use a comma to separate answers as needed.)