Which sequence describes the steps to mechanically zero the M4?

Which sequence describes the steps to mechanically zero the M4?

• A. Adjust the front sight post; 2. Adjust the elevation knob; 3. Position the apertures; 4. Rotate the windage knob
• B. Adjust the rear sight first; 2. Move the carrying handle; 3. Set the apertures to 0-100; 4. Align the windage
• C. Remove the carrying handle; 2. Zero at 300 meters; 3. Adjust windage; 4. Recheck at 100 meters
• D. Adjust the front sight post; 2. Adjust the elevation knob; 3. Position the apertures; 4. Rotate the windage knob

Answer: (A)