Final answer:
The e-commerce model described in this scenario is Business to Business (B2B). Company A and Company B are both businesses, and Company B is supplying products to Company A.
Step-by-step explanation:
The e-commerce model described in this scenario is Business to Business (B2B). Company A and Company B are both businesses, and Company B is supplying products to Company A. This is an example of B2B e-commerce, where businesses interact and conduct transactions with each other.