Which of the following is a valid example of an object? a. a and c b. all of the above c. credit card receipt d. Place Order button in an application e. text box to enter the credit card number in an application

Description: write function lastfirst() that takes one argument—a list of strings of the format "lastname, firstname" —and returns a list consisting of two lists: (a) a list of all the last names (b) a list of all the first names