The answer is transverse plane. The transverse plane would be as if you were cutting someone in half dividing the top of their body from the bottom. The frontal plane would be as if you were cutting someone in half dividing the front portion from the back portion. Sagittal plane would be as if you were cutting somebody in half dividing the right side from the left side. An oblique plane would be any plane that is not either horizontal or vertical.
~Hope this helps!
