Please choose the correct ending to complete the given sentence: Welding: Man is hammering a fence on a side of the workshop. man kneeling in the floor

Ending1: is shafting sand to build the fence. Ending2: is next to a floor of metal and nails. Ending3: is welding a metal fence. Ending4: going away the nails and wiping down the wood.

Answer format: ending1/ending2/ending3/ending4