当使用时间到达租约期的______时，DHCP客户端和DHCP服务器将更新租约。

Administrative mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dotlq
Operational Trunking Encapsulation: dotlq
egotiation of Trunking: disabled
Access Mode VLAN: 0((inactive))
Trunking Native Mode VLAN: 1(default)
Trunking VLANs Enabled: all
Trunking VLANs active: 1, 2
Pruning VLANs Enabled: 2-1001
Priority for untagged frames: 0
Override vlan tag priority: FALSE
Voice VLAN: none
在这个例子中，端口fa0/1的链路模式被设置为______状态，默认的vlan是______。

A．2400b/s
B．4800b/s
C．9600b/s
D．10Mb/s