QUESTION 17 2 p What is wrong with the following code snippet? result = num1 // num2 / num3 num1 = 20 num2 = 10 num3 = 2 print(result) O A variable is used before it is assigned a value. Nothing, the code compiles and runs. The // symbol cannot be used in a Python program. One or more of the variable names is not valid. QUESTION 18 2 points A(n) is a collection of code that has been written by someone else that is ready for you to use in your program. variable argument function library 2 points QUESTION 19 Given the following list of strings, what is the correct order using lexicographic ordring: "Ann", "amy", "Heather", "hanna", "joe", "john", "Leo", "Jim" ? amy, Ann, hanna, Heather, Jim, joe, john, Leo Ann, Heather, Jim, Leo, amy, hanna, joe, john amy, hanna, joe, john, Ann, Heather, Jim, Leo Leo, john, joe, lim, Heather, hanna, Ann, amy