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2. A worker at XYZ manufacturing company was welding on a sealed and empty metal drum that had previously contained acetone. The welding instrument burned through the surface of the thin metal, Igniting the flammable acetone vapour inside the drum. The drum exploded and struck the worker, throwing him across the room onto a concrete floor. The worker sustained fatal injuries. Analyse the given case study by using Fault Tree Analysis (FTA). The discussion should include: (a) Describe SIX steps in FTA. (6) (b) Draw FTA using the correct symbol along with the justification of the FTA symbol selection. (14)