This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make cheese toast
Butter a slice of white bread on both sides.
Try sourdough for a tangy flavor, or an airy bread like ciabatta if you like the cheese oozing through the holes and burning on the pan. Buttering both sides will create a golden crust and a moist interior.

Available choices: 1. Alternatively, squeeze some wet butter into a saucepan and add lemon juice, olive oil or worcestershire sauce. Heat on medium heat until both sides are slightly bubbly, about 15 to 20 seconds.. 2. Pour red pepper flakes into a small saucepan or pot. Place them over medium heat and stir occasionally, so they don't burn.. 3. If you use unsalted butter, add a pinch of salt to the pan to add more flavor. Fry the bread on both sides (optional).. 4. Brown the bread on both sides before cutting it down the middle and rolling it all the way out. Spread a layer of margarine over the toast..
The answer is:
3.