Cookies do which of the following:
a. track how you use a site by storing the information on your computer
b. present privacy challenges
c. can be disabled or restricted by user
d. all of the above

i'm thinking a or d.

Consider a list of full names formatted “firstname lastname”, like ["jules verne", "alexandre dumas", "maurice druon"]. write a list comprehension that produces a list with the full names in the format “lastname, firstname”. the resulting list should look like ['verne, jules', 'dumas, alexandre', 'druon, maurice']. the simplest solution may involve a nested comprehension: [ …. for … in [ … for … in … ]].