How many gateways at least does each branch need?

Your customers are moving from each branch to a SIP solution. They now have 4 G450 and the largest number’s DSP resources. They only need to use DSP resources to achieve multi-party calls. They have 3000 users, and hope that 10% of users can make multiple calls.

How many gateways at least does each branch need?
A . 1 G450 Gateway
B . 2 G450 Gateway
C . 3 G450 Gateway
D . 4 G450 Gateway

Answer: A