An investor's share trading activities for the last three years are summarised in the following table: Year Share price Action 0 $53 Bought five shares $55 Received total dividend of $10 and bought two more shares. 2 $60 Received total dividend of $21 and sold three shares. 3 $58 Received total dividend of S12 and sold the remaining shares. The arithmetic average return and dollar-weighted average return of this investment are, 1 O a. 7.92% and 9.11% respectively. Ob. 6.45% and 8.98% respectively. O c. 8.67% and 10.25% respectively. O d. 5.75% and 6.80% respectively. O e 12.56% and 14.89% respectively