Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

(1) High pO₂, low pCO₂, less H⁺, lower temperature

(2) Low pO₂, high pCO₂, more H⁺, higher temperature

(3) High pO₂, high pCO₂, less H⁺, higher temperature

(4) Low pO₂, low pCO₂, more H⁺, higher temperature