Option 1. The tier one supplier is the one that is hired to provide products or services directly to a lead firm.
This is the term that is used to refer to the producers that have to make the goods and the services available before they send it to the retailers who then make it available for the people that are going to consume the product that is in question.
The tier one supplier can be referred to as those supplies that one would have to have a direct business dealing with to contracted firms and other production partners that help in the distribution of products.
Hence we can say that the tier one supplier is the one that is hired to provide products or services directly to a lead firm.
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