30. If the power series Σa,(x-4)" converges at x = 7 and diverges at x = 9, which of the following must be true? n=0 I. The series converges at x = 1. II. The series converges at x = 2. III. The series diverges at x = -1. (A) I only (B) II only (C) I and II only (D) II and III only