Answer: Primary, Secondary, and Tertiary Sources

Sources of information or evidence are often categorized as primary, secondary, or tertiary material. These classifications are based on the originality of the material and the proximity of the source or origin. This informs the reader as to whether the author is reporting information that is first-hand or is conveying the experiences and opinions of others that are considered second-hand. Determining if a source is primary, secondary, or tertiary can be tricky. Below you will find a description of the three categories of information and examples to help you decide.

Explanation: that's my answer :-)