Please choose the correct answer to the question: During winter months, Amina sometimes notices ice covering the hoods of parked cars. Once the engine of the car runs for a while, the ice on the hood begins to melt. What form of energy is released from the car engine to melt the ice?

Answer1: chemical Answer2: electrical Answer3: heat Answer4: light

Answer format: answer1/answer2/answer3/answer4
Answer: answer3