Final answer:
Associates can gain knowledge on the new vendor's product line by completing new training, getting feedback from other vendors, and researching industry websites.
Step-by-step explanation:
The best way for associates to gain knowledge on the new vendor's product line is through a combination of options a, b, and c. Completing all new training and reviewing vendor supplied information will provide a foundational understanding of the products and their features and benefits. Getting feedback from other vendors and comparing and contrasting the new products with existing vendors' products will help associates understand their unique selling points. Researching industry websites that contain expert reviews, comparisons, and customer feedback will provide additional insights into the products.