Final answer:
A natural join requires common attributes with the same name and compatible data types in the tables being joined. It is not dependent on the exact column matches or the size of the tables.
Step-by-step explanation:
The question is asking about the requirements for a natural join operation in database management. A natural join is a type of join that is based on all the columns in two tables which have the same name and compatible data types. Therefore, the correct answer is c) Common attributes. The tables being joined must have at least one column in common with the same name and compatible data types. The size of the tables or the exact match of the columns is not relevant, as the join will be performed only on the columns with matching names. It's important to note that natural joins automatically eliminate duplicate columns from the result.