If one company headquarters have total of 150 SIP users (the largest possible to 250 users in the future), a branch of this company has 100 SIP users and required to support the primary node dual-standby, the headquarters shall deploy which of the following products is most appropriate?

If one company headquarters have total of 150 SIP users (the largest possible to 250 users in the future), a branch of this company has 100 SIP users and required to support the primary node dual-standby, the headquarters shall deploy which of the following products is most appropriate?
A . U1911
B . U1960
C . U1980
D . U1981

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Answer: B