For Which of the Following Functions Do Companies Now Use

For which of the following functions do companies now use social media?

A) Recruiting and employee engagement,but not knowledge sharing and branding
B) Knowledge sharing and branding,but not recruiting and employee engagement
C) Recruiting and knowledge sharing,but not employee engagement and branding
D) Employee engagement and branding,but not recruiting and knowledge sharing
E) Recruiting,employee engagement,knowledge sharing,and branding