Which of the following are steps to configure destination-based Remote Triggered Black Hole（RTBH）filtering？（）

A. Configure OSPF between trigger router and black hole routes
B. Configure all edge routers with static （reserved） host route to Null0
Configure BGP beteen trigger and black hole routers
D. Configure on trigger router to advertise victim host route with commumity
E. Activate black hole by redistributing route for victim into BGP with next-hop set to the static（reserved）host route configured on edge router