Which statement about the MPLS TE automatic bandwidth feature is true?
A. MPLS TE automatic bandwidth adapts automatically in an underflow scenario; overflow detection is not supported.
B. The bandwidth of the MPLS TE tunnel is reoptimized automatically during a lockdown.
C. MPLS TE automatic bandwidth measures the traffic in a tunnel and periodically adjusts the signaled bandwidth for the tunnel.
D. The MPLS TE tunnel bandwidth is updated in a fast reroute backup tunnel.