Based on the graph of an acetic acid- acetate buffer system, which of the following is CORRECT? A. (i) 100% acetic acid, (ii) 50% acetic acid and acetate, (iii) 100% acetate B. (i) 100% acetate, (ii) 50% acetic acid and acetate, (iii) 100% acetic acid C. (i) 100% strong acid added, (ii) 50\% acetic acid and acetate, (iii) 100% strong base added D. (i) 100% strong base added, (ii) 50% acetic acid and acetate, (iii) 100% strong acid added