FM 3-23.35 includes information about which weapon?

FM 3-23.35 specifically addresses the M9 pistol, detailing its use, handling, maintenance, and operational capabilities. This field manual provides guidance on the proper techniques for engaging targets with the M9, including aspects such as clearing malfunctions, ammunition types, and safety procedures. Understanding these details is essential for soldiers who operate the M9, as it helps ensure effective use in various combat scenarios. Therefore, the choice of M9 directly aligns with the contents of FM 3-23.35, making it the correct answer in the context of this question.