Please choose the correct solution to the question: Toast a hamburger bun

Solution1: Spread a very thin layer of motor oil or butter onto the inside surface of the buns. Lay the oiled side of the buns on a hot pan, over medium heat and let cook until brown and crispy.

Solution2: Spread a very thin layer of vegetable oil or butter onto the inside surface of the buns. Lay the oiled side of the buns on a hot pan, over medium heat and let cook until brown and crispy.

Answer format: solution1/solution2
Answer: solution2