1. The problem is about proper storage of a drum of lubricant oil. 2. The correct storage practices ensure safety, prevent contamination, and maintain the quality of the lubricant. 3. Important rules for storing lubricant drums include: - The complete label should be visible to identify the contents and safety information. - The drum should be kept upright to prevent leaks and contamination. - The drum should not be stored directly on the floor to avoid moisture damage; it should be on a pallet or rack. - The spigot should be kept closed to prevent contamination and spills. 4. Among the options given, the correct practice is that the drum should be kept upright. 5. Therefore, the best answer is: "drum should be kept upright". This ensures safety and maintains the lubricant's quality.