Final answer:
The responsible person must conduct a pre hot work check once a day to ensure safety. Therefore, the correct answer is option d) once a day.
Step-by-step explanation:
This question is related to Business subject and it is at the College level.
The correct answer is d) Once a day.
Before conducting any hot work, a pre hot work check must be performed by the responsible person. This check ensures that all necessary safety precautions are in place before authorizing the hot work. It is important to conduct the check once a day to minimize the risk of accidents and ensure the safety of everyone involved.