1.Y = 0.30 × R + 0.59 × B + 0.11 × G
2.Y = 0.30 × G + 0.59 × R + 0.11 × B
3.Y = 0.30 × R + 0.59 × G + 0.11 × B
4.Y = 0.30 × B + 0.59 × G + 0.11 × R
Answer:3