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The entity relationship model uses the associative entity to represent a(n) relationship between two or more entities. Select one: O a. M:N O b. 1:M O C. N:1 O d. M:1 Lecturer DEPARTMENT manages OH Key dept_id Key lect_id lect_name lect_address lect_phone dept_name According to the above diagram, how many departments may be managed by a lecturer? Select one or more: O a. one b. many O c. zero d. none A relationship is an association between Select one: a. databases b. fields O c. objects O d. entities