Privacy is of growing concern, especially when it comes to:

The correct answer is known as "individual personal information".

Individual Personal Information or Personal Information is defined as information or an opinion, consisting of facts or an opinion forming a part of a database, whether or not genuine or no longer, and whether or not recorded in a fabric shape or not, about a character whose identity is plain, or can moderately be ascertained, from the facts or opinion.

Ibelieve that the answer is (a).