Final answer:
It is false to use the primary second stage to inflate a lift bag; divers should use the octopus. Additionally, it is unsafe to position yourself below the lift bag and object during ascent, instead stay to the side and slightly above.
Step-by-step explanation:
The statement that you should use your primary second stage to inflate a lift bag, and position yourself below the bag and object as you control it to the surface is false. In scuba diving, the secondary second stage, also known as the octopus, should be used for inflating a lift bag. Using the primary second stage poses a risk of being without a breathing source during this task. Moreover, positioning yourself directly below a lift bag is unsafe as the bag or object could descend upon you if control is lost. Divers should always maintain a position that allows for a safe and controlled ascent, never directly below the lift bag or object. Instead, you should remain to the side and slightly above them.