XZ  company requires to build its network based on the modular enterprise network architecture. Z  company in Shenzhen and Xi’an each  1  R & D base ; save Beijing and Shanghai have an office building ; save  23  provincial capital cities with more than  50  people in the office ; the  200  has no more than smaller cities  8  small office person ; At any given time, there are usually more than  200  marketing and technical personnel on business trips, and some of them are often located in areas lacking  Internet  access and can only dial in to the headquarters through the telephone network.Due to environmental and cost issues, some offices cannot access the headquarters through dedicated lines or packet-switched wide area network connections.According to these circumstances, the network module that  Z  company should have is  _____  .

XZ  company requires to build its network based on the modular enterprise network architecture. Z  company in Shenzhen and Xi’an each  1  R & D base ; save Beijing and Shanghai have an office building ; save  23  provincial capital cities with more than  50  people in the office ; the  200  has no more than smaller cities  8  small office person ; At any given time, there are usually more than  200  marketing and technical personnel on business trips, and some of them are often located in areas lacking  Internet  access and can only dial in to the headquarters through the telephone network.Due to environmental and cost issues, some offices cannot access the headquarters through dedicated lines or packet-switched wide area network connections.According to these circumstances, the network module that  Z  company should have is  _____  .
A . Dial Number Access
B . An all-authentication
C . VPN  access
D . large type branch network

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Answer:   AC