A geometric sequence is defined by the recursive formula t1 = 64, tn = tn - 1 2 , where n ∈N and n > 1. The sequence is A) -64, -16, -8, -4, -2, -1, ... B) 64, 16, 8, 4, 2, 1, ... C) 64, 32, 16, 8, 4, 2, ... D) 64, 128, 256, 512, 1024, 2048, ...