Please give detailed explanations beside each code. Thanks.

Question 4a: Letter Grade (2 points) McMaster is considering a radical new grading scheme (not really) --only scores of 95 or above are ranked A, a score of 85 or above is a B, a score of 60 or above is a C, a score of 40 or above is a D, and anything below 40 is an F. Write a Python function letterGrade (score) that takes a numeric score between 0 and 100 and returns the corresponding letter grade. In [ ]: def letterGrade (score): # Your code here. return ans In [ ]: # Your Provided Sample Test Cases print("#1", letterGrade (31) == 'F') print("#2", letterGrade (50) == 'D') print("#3", letterGrade (100) == 'A'). Question 4b: Triple Letter Grade (2 points) An instructor at McMaster has grouped his students into three's. Each student gets marked individually to score an individual grade but at the end of the course, the instructor combines the grades to make a "triple-letter-grade". Write a function that takes three scores as arguments and returns the triple-letter-grade. In [ ]: def tripleLetterGrade (studenti, student2, student3): return ans In [ ]: # Your Provided Sample Test Cases print("#1", tripleLetterGrade (88,99,55) == 'BAD') print("#2", tripleLetterGrade (45,96,88) == "DAB'). print("#3", tripleLetterGrade (89,29,10) == 'BFF')