Which statements are necessary to prove the two triangles are congruent by SSS?
a) AB ≅ XY, BC ≅ YZ, ∠B≅∠Y
b) AB ≅ XY, BC ≅ YZ, ∠A≅∠X
c) AB ≅ XY, BC ≅ YZ
d) AB ≅ XY, BC ≅ YZ, AC ≅ XZ