A set of photographs has been taken for a wedding. All the guests are to be sent digitally stored copies through the ordinary postal service. There are 50 photographs and each photograph is between 1.8 and 2.5 megabytes in size. If 'A' represents the maximum storage space required for a set of photographs, 'B' represents a suitable medium to use for the copies to be sent to the guests, and 'C' represents a valid reason for choosing a medium, then ('A', 'B', 'C') = _________.