Question 1 A program converts student marks that are input as marks out of 100 to letter grades following the rules below. A mark of at least 90 earns A+ A mark of at least 80 earns A A mark of at least 70 earns B A mark of at least 60 earns C A mark of at least 50 earns D A mark below 50 means F (Failure) If a student is excused from submitting 40% or more of the gradable work for acceptable reasons such as protracted illness, a mark of I (Incomplete) is given. Then the student can make arrangements to submit missing work to complete the course after the end of term. Note: Numeric marks are recorded accurate to one decimal point (0.1) and should be rounded up to the nearest whole number (0.5+1) by the grading program. The objective of testing is to ensure that students are assigned the correct letter grade, given their numeric mark. a. Draw the diagram to show equivalence partitions and boundary values that ensure all input values are tested ( 0.5pts) Hint: ignore the incomplete situation b. ( 0.5pts) How many test cases do you think are required for complete coverage? c. And why? (How many tests do you think are needed for each partition) Describe a test case where the expected result is a pass. d. e. (0.5pts) Describe a test case where the expected result not a pass Hint: there are two possible non-pass situations. List them here to help form your title