Please choose the correct answer to the question: The mixing of cold Arctic Ocean water with warm surface Atlantic currents off the northwestern coast of Europe causes which effect?

Answer1: sinking of water as it circulates southwest Answer2: reversal of current direction back toward the European coast Answer3: rise in water salinity and upwelling of affected currents Answer4: rapid evaporation and acceleration of currents toward the pole

Answer format: answer1/answer2/answer3/answer4