Which one of the following is correct about composite attributes? a. Its components are represented as columns in a relation. b. Not represented as columns in a relation. c. Represented as a single column in a relation. d. None of the above. SQL (Relational) databases is used mainly for handling data. a. unstructured b. structured c. semi-structured d. all of the mentioned In the relational model, the number of attributes in a relation is termed as a. Entity b. Domain c. Degree d. Cardinality