Usually a middle manager who learns about a new product or services is known as product champion.
Option e
Explanation:
Someone who sees high value in a product, and develops the product or service in a systematic fashion or trend is a product champion. The product champion help and effects decision makers and investors to sell, invest, or promote the product.
Having a product champion highly increase and improve the chances of the eventual success of a product in the marketplace locally or globally or both, it is discovered by several management firms and business developers and managers. Earning interest in a particular process or product that is fully developed and marketed is the basic of a product champion.