(a) Explain what the abbreviation below stand for and explain what you understand them to mean in Cost Accounting? 1. FIFO [4 Marks] 2. LIFU [4 Marks] 3. AVCO [3 Marks) (b) Write up brief notes on the main features of the following 1. FIFO and [3 Marks) 2. LIFO methods of stock valuation [3 Marks] (c) Described the weighted average method of valuing stocks of explain who the use of this method would affect the cost of materials used marks] (d) Mention four advantages for using FIFO methods. [4 marks]