Stomatal opening and closing involves the role of various ions. In the given figure arrows depict the movement of certain ions during stomatal opening in light. Identify the ions `(P,Q,R and S)` and select the correct option.
A. `{:(P,Q,R,S),("Malate"^(2-),K^(+),CI^(-),H^(+)"):}`
B. `{:(P,Q,R,S),(K^(+),H^(+),CI^(-),"Malate"^(2-)):}`
C. `{:(P,Q,R,S),(H^(+),K^(+),CI^(-),"Malate"^(2-)):}`
D. `{:(P,Q,R,S),(K^(+),"Malate"^(2-),H^(+),CI^(-)):}`