Write grade_counts(marks) where marks maps name → score. Grades: A ≥ 85, B ≥ 70, C ≥ 50, else F. Return a dict grade → count (only grades that occur).
grade_counts({'a': 90, 'b': 72, 'c': 40, 'd': 88})
→ {'A': 2, 'B': 1, 'F': 1}grade_counts({})
→ {}Submit runs 3 tests, including hidden edge cases.
Run your code to see the output here.