5 (a) Outline the meaning of each of the following terms as used in databases: (i) domain: (ii) attribute; (iii) entity set. (3 marks) (b) Explain each of the following relational algebra statements used in database. (i) set difference. (2 marks) (ii) Cartesian product. (2 marks) (c) (i) (d) (ii) Distinguish between generalisation and specialisation as used in entisytvet.c relationship diagrams. (4 marks) With the aid of an example, explain the term functional dependency as used in database normalisation. (3 marks) A company with branches in different cities opted to use a distributed database system to manage their data. Explain three benefits that the company will gain from this approach. (6 marks)