With the aid of a diagram, explain the basic fetch - instruction cycle. (6 marks) b. In a sentence or two explain the following states of the fetch-execute cycle: (1 mark each) i. Instruction address calculation (iac) ii. Instruction fetch (if) iii. Instruction operation decoding (iod) iv. Operand address calculation (oac) c. Differentiate between computer architecture and computer organization. In your answer, include some of the attributes of the two. (5 marks)