Which statement correctly describes the Side–Angle–Side (SAS) criterion for similarity of two triangles?
(a) If three sides of a triangle are proportional to the three sides of another triangle, the triangles are similar.
(b) If two sides of one triangle are proportional to two sides of another triangle, the triangles are similar.
(c) If one angle of a triangle equals one angle of another triangle and the sides including these angles are proportional, then the triangles are similar.
(d) If two sides of a triangle are equal to two sides of another triangle and the included angle is equal, the triangles are similar.