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If an entity can exist apart from all of its related entities, then it is existence-independent, and it is referred to as a(n). entity. Select one: O a strong b. alone c. unary O d. weak A(n) is the set of possible values for a given attribute. Select one: a. range O b. key O c. identifier d. domain The entity relationship diagram (ERD) represents the database as viewed by the end user. Select one: O a. conceptual O b. condensed O c. logical O d. physical A relationship exists when an association is maintained within a single entity. Select one: O a. strong O b. ternary c. weak d. unary