(b) Given the function f(a,b,c,d) = IIM(0,2,4,6,8,9,12.13). - (1) (11) Use Karnaugh map to derive the simplest Boolean expression for f. (4 marks) Write the VHDL code using only one selected signal assignment statement to implement the simplest Boolean expression for the function f. You need to write the architecture statements only. Follow the entity statements given below. ENTITY Q1b IS PORT (a,b,c,d : IN BIT; END Q1b; f: OUT BIT); (4 marks)