单项选择题

目前BRAS承载家庭宽带最常用的认证方式是PPPOE，下列关于PPPoE的说法正确的是()

A.PPPoE协议将以太网帧封装在ppp报文之内，提供点对点的连接
B.PPPoE协议分为三个不同阶段：Discovery阶段、Offer阶段和PPP
B.PPPoE与PPP协议不同的是，PPPoE的Discovery阶段建立的是一种Client/Server关系，而PPP建立的是一种对等关系。通过Discovery阶段，一个主机(Client)可以发现一个接入集中器(Server)，在Discovery阶段正常结束后，主机和接入集中器就可以通过MAC地址和会话标识来建立PPPoE会话
D.PPPoE和PPP的协商过程完全不同

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