Whichever method has been used to deconstruct and define the tasks and sub-tasks in the design analysis, this process needs testing or validating. Data modelling uses tried and tested techniques to do this. Entity relationship modelling can be used to review databases in three main stages. Initially, 'identify entities' followed by 'identify attributes for entities', but what is the third stage?

Select one:

a. All of the above

b. Identify relationships between entities

c. Establish database table

d. Define fields and records