A network engineer is implementing a FlexVPN tunnel between two Cisco IOS routers. The FlexVPN tunnels will terminate on encrypted traffic on an interface configured with an IP MTU of 1500, and the company has a security policy to drop fragmented traffic coming into or leaving the network. The tunnel will be used to transfer TFTP data between users and internal servers. When the TFTP traffic is not traversing a VPN, it can have a maximum IP packet size of 1500. Assuming the encrypted payload will add 90 bytes, which configuration allows TFTP traffic to traverse the FlexVPN tunnel without being dropped?
A. et the tunnel IP MTU to 1500
B. et the tunnel tcp adjust-mss to 1360
C. et the tunnel tcp adjust-mss to 1460
D. et the tunnel IP MTU to 1400