Which best lists the qualifications common to someone working in Facility and Mobile Equipment Maintenance?

knowledge of engines, identifying and fixing problems, customer service skills, and ability to use tools and technical equipment
standing for long periods in uncomfortable environments, critical thinking skills, knowledge of laws and regulations, and safety knowledge
constantly watching for hazards, ability to deal with delays, work long hours and travel, and responsibility for others
identifies ways to improve a process, independence, knowledge of product supply chain, and negotiation skills