Light Activation of P680 Results in Which of the Following $\to$

Light activation of P680 results in which of the following?
(I) electron transfer as follows: Q_A $\to$ Q_B $\to$ Chlα $\to$ Pheoα
(II) electron transfer from PSI directly back to the Pheoα-Q_A complex
(III) reduction of S₄ of the OEC to S₁ of the OEC
(IV) reduction of cytochrome b₆f

A) I,III,IV
B) I,II
C) II,III
D) I only
E) IV only