题目内容
（请给出正确答案）
[主观题]
How does the ERX Edge Router interact with subscriber IP addresses assigned by an externa lDHCP server？（）
A.It monitors messages from the external server and updates the routing table as needed.
B.It maintains the leases for the DHCP server and reassigns addresses to new subscribers.
C.It sends keepalives to the subscriber and makes the address available when the subscriber stops responding.
D.It sends keepalives to the subscriber and removes the host route when the subscriber stops responding.
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