Q5. A) A year is a leap year if it is divisible by 4, except that years divisible by 100 are not leap years unless they are also divisible by 400. Write a function that take year as a parameter and returns whether it is a leap year or not B) Write a Python script to check whether a given key already exists in a dictionary C) Write a Python script to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x) D) Access the value of key, 'history' sampleDictionary = { "class":{ "student": { "name":"Eunice" "Marks: { "physics": 70, "history":80 } 6