You begin a new job at a refinery. During your first few months on the job you came to the realization that while the OSHA PSM regulation came into effect in 1992, your company is yet to implement it (even after 27 years!). You recalled your learnings from SENG321/670 that there were 14 major elements/sections to the regulation. With limited time and resources, you have been given approval to start by implementing four elements/sections. Which four will you choose based on them having the most benefit to operations, and most importantly, WHY? Your choice should not be based on the easiest/simplest choice. (Note, there is no single correct answer, but credit will depend on your reasoning/justification for choice.)