A nurse is teaching an in-service about the safe use of equipment to a newly licensed nurse. Which of the following statements made by the newly licensed nurse indicates an understanding of the teaching?

"I should grasp the cord when unplugging equipment."

"I should make sure oxygen cylinders are placed in an upright position."

"When using a fire extinguisher, squeeze the handle and pull the pin."

"It is ok to clean equipment while it is plugged into the wall."