Rommel promises to deliver to Ellis the newest model of AirPods. Their contract contains a penal clause that in case of non-fulfillment, Rommel shall pay a penalty of P10,000. Rommel wants to just pay the penalty instead of delivering the AirPods. What are Ellis' rights, if any, in this situation? (must have legal basis and reference to the articles on Obligations in the Civil Code as much as possible)