Which two effects of configuring the tunnel path-mtu-discovery command on a GRE tunnel interface are true? (Choose two)
A. The maximum path MTU across the GRE tunnel is set to 65534 bytes.
B. If a lower MTU link between the IPsec peers is detected , the GRE tunnel MTU are changed.
C. The router adjusts the MTU value it sends to the GRE tunnel interface in the TCP SYN packet.
D. It disables PMTUD discovery for tunnel interfaces.
E. The DF bit are copied to the GRE IP header.
F. The minimum path MTU across the GRE tunnel is set to 1476 bytes.
