Answer:
- Supporting.
Explanation:
Supporting details are exemplified as the details like evidence in the form of facts or reason or the use of quotations or statistics that would function to act as a support to back the central idea or claim of the author and enhance the credibility of the claim.
The authors employ these details to 'strengthen their ideas and opinions' and convey them with more efficacy and clarity. These details may include the facts, comparison, statistics or quotation that would serve to enhance the validity of the author/speaker's claim or idea and make it more illustrative and clear for the audience to accept, believe, and elicit the desired response.
It's the 2nd and 4th one.
Hope this helps! (:
A search engine is a program that searches/identify items in a database which corresponds to keywords specified by the user. A meta search engine is an online information retrieval tool that uses data of a web (search English) and that makes its own results. A subject directory is a service which offers a collection of links to the internet which is posted by creators. Hope this helped!