多选题What are three RSVP messages？（）APathErr：Path errorBResvErr：Reservation errorCPathConf：Path confirmationDResvConf：Reservation confirmation
题目
多选题
What are three RSVP messages？（）
A
PathErr：Path error
B
ResvErr：Reservation error
C
PathConf：Path confirmation
D
ResvConf：Reservation confirmation