A credit card company has a policy wherein the customer earns a point for every 20 dollars spent on purchases made using the card. These points accumulate over a period of time and can be cashed in at the rate of a dollar per point. The policy applies equally to all customers across the country and the company does not interact with individual customers. This is an example of the ______ level of relationship marketing.a. financialb. socialc. customizationd. structural