Question 5: (6 +18 Marks) (a) Design a Graphical User Interface (GUI) for a VB application that: - reads three grades for a student - finds and displays the minimum grade -Computes and displays the summation of the best two grades (i.e. exclude the minimum from grades summation) > Write down the name of each control next to your design 0.5 mark for each control (6) Write VB code that solves the problem stated in part (a): 1 mark for gach staententt