What is the most important role of the Business Developer?

His role is highly related as a business analyst to develop the business case of the project

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It is enhance company product and innovate new one 

Thank you for the invitation

----------It is enhance company product and innovate new one 

I think option#1 --------------------------------------

To bring more business and add more revenue to the company.

Thank you. My answer is 1st one........................

Thanks for the invitation. I second the answers given by experts here.

Thanks for invitation,

Enhance The company's existing products and innovate  new products.

Acting as an ambassador for the company by promoting the firm's services to clients and external groups in a clear and effective way that promote generate sales.