Answer:
a. model base
Step-by-step explanation:
Decision support system consist of various components. The component include: database known as the knowledge base, the model and the user interface.
From the available option:
Model base (a) is the component that include mathematical and statistical models and interact with the database to enable the system analyze and make decision.
User interface (d) is the interface that is available for the user to interact with the system. So, it is not the correct answer.
DSS engine (b) contains the information stored in the system. So, it is not the correct answer.
Database model (c) is the template used in designing the database of the system. So it is not the correct answer.
The model base component of a decision support system (DSS) includes mathematical and statistical models that, along with the database, enable a DSS to analyze information.