I must play at (0,2) for two crucial reasons:
1. Defensive: Block O from winning in the top row (they already have positions 0,0 and 0,1)
2. Offensive: This creates two potential winning paths for me:
   - A diagonal line from top-right to bottom-left
   - A vertical line in the rightmost column
This is the optimal move as it combines both defensive necessity and offensive opportunity.