solve and explain

oO Determine whether the series cos Inn converges or diverges. If it converges, find its sum. n=0 i Select the correct choice below and, if necessary, fill in the answer box within your choice. k ) A, The series converges because lim cos 9nz fails to exist. Koo n-0 ) B. The series diverges because it is a geometric series with |r| = 1. The series converges because lim cos 9nx=0. The sum of the series is (oc. noo (Type an exact answer, using radicals as needed.) = The series converges because it is a geometric series with |r|