A person cannot be examined as a witness in the following cases:
1. Superseded by N.D.R.Ev. 501, 502.
2. Superseded by N.D.R.Ev. 501, 505.
3. Superseded by N.D.R.Ev. 501, 503.
4. A public officer cannot be examined as to communications made to the public officer in official confidence when the public interests would suffer by the disclosure.