An engineer has performed the lockout/tagout process before working on a transformer. He first notified all personnel of the procedure and made sure that no other vendors would be working on this piece of equipment. The engineer de-energizes the transformer, while making sure to release all stored energy. Locks and tags are validated and the engineer places his personal lock on the transformer door. The engineer makes sure to hold the lockout key during maintenance. He then confirms that the machine is ready for servicing. Which critical procedure did the employee neglect? Select the correct response and submit. A. Starting the machine for a second time to confirm energy isolation B. Proper tagout C. Ensuring that all lockout/tags were placed from all appropriate venders D. Employee Notification