Which of the following is an example of input control test?

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A) 50 B) 75 C) 25 D) 100

Given the following relational schema and its functional dependencies:

 (a) Specify candidate keys and state the primary key. (b) Assuming that the relation is in first normal form (1NF), describe and illustrate the process of normalising the relational schema to second (2NF) and third (3NF) normal forms. Identify the primary and foreign keys in your third normal forms.