Which two encapsulation methods require that an 827 ADSL router be configured with a PPPusername and CHAP password？（）

A. PPPoE with the 827 configured as a bridge
B. PPPoE with the 827 configured as the PPPoE client
C. PPPoA
D. RFC 1483 Bridged with the 827 configured as the PPPoE client
E. RFC 1482 Bridged with the 827 configured as a bridge