What is the requirement for data to be in First Normal Form (1NF)?

In the context of database normalization, First Normal Form (1NF) is a fundamental criterion that a relational database must satisfy to ensure the structure is efficient and free of redundancies. For data to adhere to 1NF, it must be organized so that each column or field within a table contains only atomic, indivisible values. This means that there can be no multiple values or lists in any field, ensuring that each column represents a single piece of data.

Moreover, the requirement that there be no duplicate rows throughout the table helps maintain the uniqueness of records. By adhering to these principles, data integrity is improved, and it becomes easier to perform queries and analysis without complications arising from complex and non-atomic data structures. Overall, the conditions for 1NF aim to simplify the database structure and enhance data management practices, making option C the correct choice.