Identify if the following sequence is arithmetic, geometric, or none of them. In the case of an arithmetic sequence, determine its common difference, and in the case of a geometric sequence, determine its common ratio.
a_n = n³ + 1

• A. Geometric Sequence, common ratio = 1
• B. Arithmetic Sequence, common difference = 1
• C. Arithmetic Sequence, common difference = -1
• D. Neither arithmetic nor geometric

Answer: (D)