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Root denied on an NFS share

On an NFS client, root gets "Permission denied" writing to a share that a normal user with the matching UID can write to. What is the usual reason?

A.NFS only allows writes from users without a shellB.The client kernel blocks root from all network filesystemsC.The server's root_squash maps client root to an unprivileged userD.The share is mounted with noexec, which also blocks root writes

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Root denied on an NFS share

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