A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from

• A. two points propagating in two different non-parallel directions.
• B. two points propagating in two different parallel directions.
• C. one point propagating in two different directions.
• D. one point propagating in the same direction.