Consider a search engine Sen for news documents. Sen is supported by a crawler Chad. Chad downloads documents from a web

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Consider a search engine Sen for news documents.
Sen is supported by a crawler Chad.
Chad downloads documents from a web of authenticatedsource-databases producing verified news. The databases arefrequently assessed and rated by each other as well by readers ofnews. Ratings by readers who read a large number of documentsfrom a variety of sources weigh more than ratings by readers whoread very little or read only from a limited set of sources.Ratings by sources that are rated high weigh more than ratings bysources that are not rated high. Sen is also supportedby an indexing system, Ida. Ida filters documents downloaded byChad for content free of violence, orders them based on chronologyas well asthe ratings assigned to the sources (i.e. the databases), andstores them in an inverted index. Explain which of the rankingmodels - amongPopularity, Quality, Relevance, Suitability, and Timeliness - areused and how by Sen?