<prompt> Human: Hello all,I travel for business and use a credit card for expenses which are paid back weekly; I dont carry a balance. For this reason, Im looking to maximize cashback. Ive been using a Discover but am starting to get irritated as Ive been to several locations where it is not accepted, and now I find that I cannot enroll it in my airport rewards program. So, Im looking for a cashback VISA or Mastercard. Does anybody know what kind of card the Citibank DC card is? Is Citibank its own network, or is it part of Mastercard or Visa?-Thanks  <response>: Its a master card. I agree that its pretty difficult to find that information in the advertising for it. 