Which of the following descriptions of BFD detection characteristics is incorrect?

Which of the following descriptions of BFD detection characteristics is incorrect?
A . Reduce application interruption time and improve network reliability
B . Establish a session between the two devices to monitor the bidirectional forwarding path
C . Provide a detection time of less than 1 second to speed up network convergence
D . Fault detection can only be performed on the bidirectional forwarding path of the directly connected physical link between network devices.

Answer: D