A class grade application for instructors assigns letter grades based on students’ numerical grades. The letter grades for different numerical grades should be:
Above 89, up to 100 - A -
Above 79, up to 89 - B -
Above 69, up to 79 - C -
Above 59. up to 69 - D -
Below 60 - F -
Which of the following sets of test inputs would achieve the relatively highest equivalence partition coverage?
To achieve the highest equivalence partition coverage, the selected set of test inputs should include values that cover the boundaries between the different grade categories. The set 69, 79, 80, 89, 90 achieves this by testing the boundaries between C and B (79), B and A (89), and includes both an outlier high score (90) and near-boundary values within B grade (80) and C grade (69). This set covers multiple partitions effectively.
Must be B.