I have a question saying that. "Now, suppose there are only two electric vehicle producers - Tesla and BMW. Using game theory, explain whether BMW and Tesla will design the same plug or different plug. What factors should the firms take into consideration?"

I believe that either one of the firms (Tesla or BMW) is making its charging plug for the car, then according to game theory, another firm will do the same. But I don't understand why they would do that. I need help with answering this question.