input: [Preset duration] Six months from the configuration or update. [Description] Stores the referral or campaign that explains how the user arrived at the site. The cookie is created when the JavaScript library is executed and is updated whenever data are sent to Google Analytics. [Cookie name] 
output: __utmz
options: _ _ u t m a
options: _ _ u t m b
options: _ _ u t m c
options: _ _ u t m z
options: _ _ u t m v
options: _ _ g a