DHCP客户端在成功获取IP地址后，会发送哪种类型的DHCP报文？（）

A.option time-offset
B.option subnet-mask
C.option routers
D.option domain-name-servers

A.67
B.80
C.68
D.53

A.DHCP DISCOVER
B.DHCP REQUEST
C.DHCP ACK
D.DHCP OFFER