which two shaders are required for a technique to function properly?

With regard to a high-level shading language (HLSL) effect file, which two shaders are
required for a technique to function properly? (Choose two.)

A.
vertex

B.
Hull

C.
Domain

D.
Pixel

E.
Geometry

Explanation:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb509635(v=vs.85).aspx