Refer to the exhibit. The network has been configured with H.323 gateways and gatekeepers as shown. Which statement is true when a call is placed？（）

• A、A gatekeeper is contacted to determine the correct local gateway to use.
• B、A gateway will receive the call and forward a call request to the local gatekeeper.
• C、A gateway will receive the call and forward a call request to the gatekeeper on the other side of the WAN
• D、A gatekeeper will receive the call and forward a call request to the remote gateway.