Which of the following statements is true with regard to light reaction of photosynthetic mechanism in plants
A. Chlorophyll a occurs with peak absorption at 680 nm in PS I and 700 nm in PS II
B. Mg and Na are associated with photolysis of `H_(2)O`
C. `O_(2)` is evolved during cyclic photophosphorylation
D. PS I and PS II are both involved in noncyclic photophosphorylation
