A key is a unique identifier that should be created and used when designing a database for each type of entity, in order to store and retrieve data accurately. Select one: a. foreign b. super c. primary d. candidate e. surrogate

Why is it uncommon for users to perform searches directly in database tables? a.)users are discouraged from interacting directly with tables because they might confuse tables with spreadsheets. b.) users are discouraged from interacting directly with tables because this may result in unintended changes to source data. c.)users do not have the technical skills required to perform searches directly in database tables. d.)users do not have the permissions required to perform searches directly in database tables.