Please choose the correct answer to the question: How can it be shown that an electrical conductor is a vehicle for the flow of electricity?

Answer1: holding an electrified fence can kill you Answer2: electricity is unable to conduct well through rubber shoe soles Answer3: sticking a fork into an electrical outlet is safe if it is plastic Answer4: electricity is a volatile thing

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