In social media, negative comments and complaints can illuminate unknown brand flaws.

Yes it is true that in social media, negative comments and complaints can illuminate unknown brand flaws.  Social media it is any tool or service that uses the Internet to facilitate conversations, offer more one-to-one ways to meet consumers. the process of knowing and assessing what is being said about a company, individual, product, or brand; Negative comments and complaints are of particular importance, both because they can illuminate unknown brand flaws is Social media monitoring. 

answer; ///i believe the answer is (d) procedures to control the quailty of your product;