Which of the following is not a type of database?a.Networkb.Hierarchicalc.Relationald.Decentralized

To determine which of the options is not a type of database, let's analyze each choice:

1. Network: This is a type of database structure that allows different records to be connected to one another in a graph-like manner. It supports many-to-many relationships between data entities.

2. Hierarchical: This is another type of database model that organizes data in a tree-like structure. Records have a parent-child relationship, with one parent being able to link to multiple children, but each child can have only one parent.

3. Relational: This is the most common type of database, where data is stored in tables that can be related to one another through keys. It uses Structured Query Language (SQL) for data manipulation.

4. Decentralized: While this term can refer to systems where control and data are distributed, it is not classified as a specific type of database model like the others. Instead, it relates more to the architecture of systems rather than the structure of the databases themselves.

Conclusion

The option that is not a type of database is d. Decentralized.