Final answer:
The prone position is one of the four standard rifle-firing positions, characterized by lying flat on the stomach, often with arms in front to hold and stabilize the rifle.
Step-by-step explanation:
One of the four standard rifle-firing positions is prone. This position involves the shooter lying flat on their stomach. The definition of prone, according to the options provided, is: a person is prone with upper limbs, including palms, touching sides and lower limbs touching at sides. In a military or shooting sports context, while in the prone firing position, shooters will often have their arms in front of them to stabilize the rifle, not touching their sides. Variations to the standard firing positions include sitting or kneeling, such as the example of a photographer bracing her arm and elbow on her knee for stability. Understanding these positions is crucial for safety and accuracy when operating firearms.
The answer key:
- Prone
- Crouching
- Kneeling
- Standing