Question 5. a. Discuss the focus of the following software testing types: Unit Testing i. ii. iii. iv. V. vi. Component Testing System Testing Integrated Testing White-box testing Black-box testing (12 marks) b. With an aid of a well-drawn software acceptance testing model, explain why acceptance testing is very important before a software is released. (4 marks) c. Discuss the distinction between software verification and validation. (4 marks)