Which of the following statements about internet is (are) correct?
Ⅰ.Each host in internet only has a IP address.
Ⅱ.It is possible to have multiple names corresponding to the same IP address.
Ⅲ.In users' points, Internet means a virtual network.
A．None
B．Ⅰ and Ⅱ
C．Ⅱ and Ⅲ
D．All