John signed a two year contract with Z$-$Gadget to get a subsidized price on his new iPhone. He had Z$-$Gadget's service for only $6$ months and has been dissatisfied with its service and wanted to cancel the contract. However, he did not do so because he will have to spend a lot for canceling his Z$-$Gadget contract and signing up for another alternative. Which of the following characteristics of a powerful supplier group does Z$-$Gadget have with respect to its contract with John?

Question $24$ options:

The supplier industry is more concentrated than the industry it sells to

Industry participants face switching costs in changing suppliers

Suppliers offer differentiated products

No substitutes exist for what the supplier group provides