Solve it for me please

Determine the radius of convergence of the following power series. Then test the endpoints to determine the interval of convergence. X k " . . The radius of convergence is R = Select the correct choice below and fill in the answer box to complete your choice. O A. The interval of convergence is (Simplify your answer. Type an exact answer. Type your answer in interval notation.) O B. The interval of convergence is {x: x = (Simplify your answer. Type an exact answer.)