After you configure a GRE tunnel between two networks, the tunnel comes up normally, but workstations on each side of the tunnel cannot communicate. Which reason for the problem is most likely true?
The question leaves a lot for interpretation but I do think that it should be D. The question says 'the tunnel comes up normally, but the workstations [...] cannot communicate'. This implies that tunnels are used more often and a default route should be defined. When the route is undefined, the whole tunnel goes down. And in this case, the question suggests that the tunnel doesn't go down completely but that there is no connectivity. So it should be a MTU issue. See also:
https://community.cisco.com/t5/routing/gre-issue-tunnel-up-down-on-one-side-and-up-up-on-the-other-side/td-p/2414642
I think "D" is likely wrong. I believe C. The route between the networks is undefined is more likely to be the correct answer.
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