What are the two types of approved transport methods for the M9 service pistol?

The correct choice identifies "Holster and Administrative" as the two approved transport methods for the M9 service pistol. A holster provides a secure and practical means of carrying the firearm, ensuring it is readily accessible while minimizing the risk of accidental discharge or loss. This method adheres to safety protocols and allows for quick deployment when necessary.

Administrative transport is another approved method, which typically implies carrying the pistol in a manner compliant with regulations but not necessarily in a combat-ready stance. This can include situations where the weapon is being moved for maintenance, inspection, or during non-operational conditions, all while still following prescribed safety guidelines.

The other choices suggest alternatives that may not comply with official transportation policies regarding the M9. For example, while hand carrying might seem practical, it does not ensure the same level of safety and accessibility as a holster. Similarly, options involving slings or backpacks do not align with recognized standards for firearm transport and could pose risks during movement.