If we use a normal switch in our network, which layer do we expect our packets reach up most? -not end devices, only switch- select one: a. data link b. application c. osi model d. transport e. presentation

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