Question: 47 2 points What best describes a null value? O the string null an intentional nothing a zero-length string, a space or tab character 48

47 2 points What best describes a null value? O the string "null" an intentional nothing a zero-length string, a space or tab character 48 2 points Referential integrity is the set of rules applicable to Foreign keys Primary keys Business O Legal values 49 2 points A is a set of database specifications that can actually be implemented in a specific DBMS product. O Database Model DBMS Database management Database Design 50 2 points Repeating values in attributes are removed in which normal form? O 4NF O 3NF O 1NF O 2NF

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