For the purposes of this Part, if:
(a) a carriage service provider (the first provider ) supplies, or proposes to supply, a carriage service to another carriage service provider (the second provider ); and
(b) the carriage service is, or is to be, supplied to the second provider in order that the second provider can provide a carriage service;
then:
(c) the carriage service that is, or is to be, supplied to the second provider is a wholesale carriage service ; and
(d) the second provider is a wholesale customer of the first provider.