Question: What is AS path prepending? when a router, sending a BGP update, adds the AS number of the router from which it received the route

What is AS path prepending?
when a router, sending a BGP update, adds the AS number of the router from which it received the route to the AS-path attribute
when a router, sending a BGP update, adds the AS number of the router to which it is sending the route to the AS-path attribute
when a router, sending a BGP update, adds its AS number to the AS-path attribute multiple times
when a router uses the AS-path attribute during route selection

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