Helen looked ______ when she heard the good news. [ ]

A. sad

B. happily

C. sadly

D. pleased

某公司网络中DHCP服务器可动态分配IP地址范围为192.168.0.100～192.168.0.200，其中192.168.0.100保留给MAC地址是00-11-22-33-44-55的主机。网络中某客户机从该服务器获取IP地址的过程中，在客户机捕获的4条报文及对第4条报文的分析如下图所示。请分析其中的信息，补全内容。
编号 报文摘要
1DHCP:Request,Type:DHCP discover
2DHCP:Reply,Type:DHCP offer
3DHCP:Request,Type:DHCP Request
4DHCP:Reply,Type:DHCP ______
IP:Destination Address=______, Source Address=______
UDP:Destination Port=67,Source Port=68
DHCP:-----DHCP Header-----
DHCP:Boot record type =2(Reply)
DHCP:Hardware address type =1(10M Ethernet)
DHCP:Hardware address length =6 bytes
DHCP:Hops =0
DHCP:Transaction id =604D121F
DHCP:Elapsed boot time =1024 seconds
DHCP:Flags =0000
DHCP:0 =no broadcast
DHCP:Client self-assigned address =[0.0.0.0]
DHCP:Client address =______
DHCP:Next Server to use in bootstrap =[0.0.0.0]
DHCP:Relay Agent =______
DHCP:Client hardware address =001122334455
DHCP:Host name =""
DHCP:Boot file name =""
DHCP:Vendor Information tag =53825276
DHCP:Message Type =5
DHCP:Address renewel interval =345600 (seconds)
DHCP:Address rebinding interval =604800(seconds)
DHCP:Request IP Address leased time =691200(seconds)
DHCP:Server IP Address =192.168.0.1
DHCP:Subnet mask =255.255.255.0
……