A large valve, usually installed above the ram preventers, that forms a seal in the annular space between the pipe and wellbore or, if no pipe is present, on the wellbore itself is called the __________.

Correct Answer: Option D — annular blowout preventer

The annular blowout preventer uses a large, reinforced rubber packing element to seal the space around the drill pipe or the open hole. It is a primary well control device designed to contain pressure and prevent uncontrolled flow of formation fluids during drilling or well intervention operations.