The correct answer to this question is 4 planes. Spherical Quadrilateral is a part of Spherical trigonometry, which is a branch of Spherical Geometry. The aspherical quadrilateral is treated as a number of spherical triangles.
These concepts are used and are important in calculations for astronomy and navigation. The origins of these concepts date back to Greek and Islamic mathematics. Mathematicians like John Napier and Delambre were important to the evolution of these theories.
Along with spherical quadrilateral's, there are a number of other parts of spherical trigonometry like spherical polygons, polar triangles, cosines, Delambre (or Gauss) analogies, formulae, and sines.
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