a) Given the following POSTFIX notation: PQR $$ S * T + U V W$/- i) Draw an expression tree based on the above notation. (5 marks) ii) Based on the expression tree drawn in 2(a)(i): . Traverse the expression tree in INFIX notation Traverse the expression tree in PREFIX notation Given the values of the variables are P=4, Q=1, R=2, S=5, T=6, U=512, V=8, W=3, evaluate the above expression using STACK configuration. (10 marks)