Recall that an important concept in IR is that of a document.

Which of the following statement$($s$)$ is $($are$)$ true about it$?$

Question $2$Select all that apply:

A document is the unit of storage and retrieval in an IR system.

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The system designer is the one who decides how to break down real world objects $($e$.$g$.,$ a book$)$ into documents $($e$.$g$.,$ chapters of the book$).$

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At least theoretically, an IR system must evaluate each query against all documents to determine if they are relevant or not.

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In a typical IR system, the query specifies what the document should be$.$

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In a typical IR system the user can choose what the document should be for all of their queries.