Answer:
d. technical designer
Step-by-step explanation:
In a decision support system, the technical designer is responsible for the implementation of the DSS and handle issues like data storage, file structuring, response time and security measures.
Model builders are responsible for providing specifications for the model.
Managerial designers are responsible for defining management issues and providing the requirements of what the model should do.
Users are not involved in the development or implementation of the DSS.
Therefore, the answer is d. technical designer