Which of the Following Scenarios Can an AS-Path-Filter Be Used

Which of the following scenarios can an AS-path-filter be used for? (Multiple Choice)

A) Apply clauses in a route-policy
B) Filtering the routes received from a BGP peer based on the as-path attributes of the routes, for example, peer X.X.X.X as path-filter import
C) Filtering the routes sent to a BGP peer based on the as-path attributes of the routers, for example, peer X.X.X.X as-path-filter export
D) If-match clauses in a route-policy