某主机的MAC地址为00-FF-12-CD-10-22，其IP地址配置选项设置为“自动配置”，该主机可通过发送( )报文以查找DHCP服务器，并请求IP地址配置信息，报文的源MAC地址是( )，源IP地址是( )。
A．DHCPdiscover
B．DHCPrequest
C．DHCPrenew
D．DHCPack

A．0:0:0:0:0:0:0:0

B．FF:FF:FF:FF:FF:FF:FF:FF
C．00-FF-12-CD-10-22
D．00-FF-12-CD-FF-FF

A．127.0.0.1

B．255.255.255.255
C．0.0.0.0
D．169.254.18.254