单项选择题

When is the connection concentrator enabled?（）

A.When the value of MAX_CONNECTIONS is greater than the value of MAX_COORDAGENTS.
B.When the value of MAX_AGENTS is greater than the value of MAX_CLIENTS.
C.When the value of NUM_AGENTS is greater than the value of MAX_AGENTS.
D.When the value of NUM_CONNECTIONS is greater than the value of NUM_COORDAGENTS.

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