When Consumers Change Mobile Phone and Data Service Providers, They

Multiple Choice

When consumers change mobile phone and data service providers, they may be required to maintain service with the provider for a specified time period.  This is an example of a: 

A) cost to a producer to exchange equipment in a facility when new technologies emerge.
B) cost of changing the firm's strategic group.
C) one-time cost suppliers incur when selling to a different customer.
D) one-time cost customers incur when buying from a different supplier.