The “Nothing-at-Stake” problem that could be realized by Proof of Stake networks would be caused by what?

The “Nothing-at-Stake” problem that could be realized by Proof of Stake networks would be caused by what?
A . If all of the validator nodes are taken offline
B . If validator nodes reject all transactions
C . Validator nodes approving all transactions on old and new software after a hard fork occurs
D . All of the above

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Answer: D