Final answer:
The real tool among the options is a 4. Caulking Gun, used to seal joints or seams in construction and repairs.
Step-by-step explanation:
Among the options listed, the real tool is the 4. Caulking Gun. This is a hand-held implement used in construction and repairs to dispense caulking, which is a material used to seal joints or seams against leakage in various structures and piping.
The caulking gun consists of a metal or plastic tube which holds the caulking material, a trigger mechanism, and a plunger or rod that pushes the material out through a nozzle at the front. It is commonly used to seal gaps in windows, doors, plumbing, and many other applications.