Which of the following options describe the components of the call that flow around and the components that flow through the device?

When a Cisco Unified Border Element connects two VoIP streams using flow-around media, which of the following options describe the components of the call that flow around and the components that flow through the device?
A. All security information flows through the Cisco Unified Border Element, and all call signaling and RTP flows around the device.
B. Call signaling flows through and call media flows around the device.
C. Call media flows through and call signaling flows around the device.
D. The initial call-signaling traffic flows through the device to initiate the call and then all subsequent calls flow around the device.