Final answer:
The consistency property in relational databases ensures data integrity and accuracy by maintaining the validity of data and enforcing constraints. The correct option is A.
Step-by-step explanation:
When considering the consistency property supported by all relational databases, it is important to understand its role in the context of database management systems (DBMS). Among the options provided, option a) Ensures data integrity and accuracy is true.
The concept of consistency in relational databases is a fundamental aspect of the ACID principles which stand for Atomicity, Consistency, Isolation, and Durability. These principles ensure transaction reliability in any database system. Consistency refers to the guarantee that when a transaction converts a database from one valid state to another, it must preserve the declared explicit and implicit constraints. Constraints include primary keys, foreign keys, unique constraints, and check constraints that prevent duplication and enforce relationships between tables.
The purpose of data integrity is to maintain the accuracy and validity of data in the database. The enforcement of data integrity ensures that the information recorded in the database is correct and that any changes made to the data, such as updates, deletes, or inserts, do not result in a violation of these constraints. Thus, even if multiple transactions are occurring simultaneously, each transaction will leave the database in a state that is consistent with the defined rules.
As a direct contrast, options b), c), and d) do not relate to the concept of consistency as they describe redundancy, unstructured storage, and fragmentation respectively, which are different database concepts and do not pertain to integrity and accuracy directly.