(D) All of the above
Since, LinkedIn is a professional and employment focused social network you can use LinkedIn profile targeting to target customers based on Company such as Microsoft, Google, etc. Job profile such as Sales, Accounting, etc. and Industry such as Finance, Law Enforcement.
This question is a part of the Microsoft Advertising Certified Professional exam. You can find all the answers with detailed explanation for this exam in the Microsoft Advertising Certified Professional exam page.