Under What Conditions Will the Gauge Pressure of a Cylinder

Under what conditions will the gauge pressure of a cylinder of N₂O accurately represent its contents?
1) When the liquid in the cylinder has completely vaporized
2) When the ambient temperature exceeds the critical temperature
3) When the filling density is less than 1.0 (water-filled)

A) 1 and 2 only
B) 1 and 3 only
C) 2 only
D) 1, 2, and 3