DBMS GATE CS PYQ 2024 SET 2

The relation schema, Person(pid,city), describes the city of residence for every person uniquely identified by pid. The following relational algebra operators are available: selection, projection, cross product, and rename. To find the list of cities where at least 3 persons reside, using the above operators, the minimum number of cross product operations that must be used is (A) 1 (B) 2 (C) 3 (D) 4