Final answer:
The data controlling language is not available in the relational data model.
Step-by-step explanation:
The correct answer is d. Data controlling language. In the relational data model, there are three main components: data definition language (DDL), data manipulation language (DML), and data query language (DQL). DDL is used to define and modify the structure of the database, DML is used to manipulate the data stored in the database, and DQL is used to retrieve data from the database. However, data controlling language is not a part of the relational data model.