Aminah has a supermarket located in Kuala Kangsar, Perak. This supermarket is managed by the local people. One day, Aminah decided to make a sudden visit to her supermarket to conduct an internal audit. As a result of her investigation, it was found that the supermarket does not has an organized management system, specifically for its inventory. Required: Discuss any THREE (3) inventory valuation methods. Based on your knowledge, suggest the appropriate inventory valuation method to be applied by Aminah's supermarket. Provide your reasons