(ii) payphones; and
(iii) prescribed carriage services; and
(iv) digital data services;
(ba) the digital data service obligation described in section 19A should be fulfilled as efficiently and economically as practicable;
(c) the losses that result from supplying loss-making services in the course of fulfilling the universal service obligation should be shared among carriers;
(d) information on the basis of which, and the methods by which, those losses and those carriers' respective shares in those losses are to be determined should be open to scrutiny by:
(ii) the public;
(e) certain costs associated with fulfilling the digital data service obligation should be shared among carriers.