Who became the first major pizza chain to include a dipping sauce with every original crust or square pan pizza, as well as a peperoncini pepper?

Papa John's became the first major pizza chain to include a dipping sauce with every pizza order, along with a pepperoncini pepper, as part of their brand differentiation strategy. This became a signature feature of their service. Options A and B are larger chains that didn't pioneer this practice, while D is not a major chain.