Choice "A" is correct. II only is correct. Statement I is incorrect. In a relational database, the data are stored in two-dimensional tables that are related to each other by keys, not implemented by indexes and linked lists. Indexes and linked lists were normally used in the earlier hierarchical and tree-structured databases. Statement II is correct. Normalization is the process of separating data into logical tables. Data normalization is required before a relational database can be designed. Statement III is incorrect. Object-oriented databases can be used to store comments, drawings, images, voice, and video that do not normally fit into more structured databases. However, object-oriented databases are normally slower than, not faster than, relational databases.Choices "c", "d", and "b" are incorrect, per the above explanation.