问题：
[单选题] We have already covered the topic of network addresses. The first（71）in a block (in classes A,B,and C) defines the network address. In classes A,B,and C,if the hostid is all ls, the address is called
A、unicast
B、multicast
C、broadcast
D、anycast
参考答案：
C、broadcast
● 参考解析
