Final answer:
The "Revealed by" classification refers to information disclosed through investigation or because it was previously concealed, aligning with options 2 and 3 from the given choices.
Step-by-step explanation:
The classification concept of "Revealed by" is best associated with options 2 and 3 from the provided list. It is not typically used to classify information that is publicly available, which would make option 1 incorrect. Rather, "Revealed by" applies to information that becomes known through analysis, investigation, or because it was previously hidden or undisclosed, which aligns with option 2 and 3. This kind of classification is crucial in disciplines such as science, law, and investigative journalism, where the discovery of knowledge is often the result of long, meticulous processes. For example, a scientific theory or law is often an explanation of natural phenomena that has been revealed through rigorous testing and observation. In law, certain facts may be revealed through the process of discovery or the admission of evidence during a trial. Also, some job markets may have a percentage of hidden positions that are only discovered through networking or other investigative methods.