单选题When is the site-to-site remote access model appropriate？ （）A for multiple ISDN connectionsB for modem concentrated dial-up connectionsC for a group of users in the same vicinity sharing a connectionD for use by mobile users
单选题
When is the site-to-site remote access model appropriate？ （）
A
for multiple ISDN connections
B
for modem concentrated dial-up connections
C
for a group of users in the same vicinity sharing a connection
D
for use by mobile users
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