There are different types of information systems based on the different levels of hierarchy in an organization. Which system helps support business decision-making activities by manipulating and building upon the information from the systems below it in the hierarchy?

a.) DSS
b.) EIS
c.) TPS
d.) MIS

Decision Support System is an interactive information system that intends to help the people in an organization in business decision making.
These software based systems obtain large volumes of knowledge produced from the various related information systems included in corporate business processes.
DSS comprises of three main components that are, software system, database and user interface.
DSS gathers, manages and assesses business data to enable better business decision making and planning.
This aids organizations to detect and solve various semi-structured and unstructured problems and make decisions.
It helps to make the decision making process quick and efficient.
It helps to automate and simplify organizational processes and makes interpersonal interaction easier. DSS is flexible and adaptive to support the changes in decision making process of a user.
DSS enables decision makers to collect a range of data from various sources like raw data, records, management, business models, administrators etc.
DSS are used in medical diagnosis (clinical decision support systems),business management, forest management, railway systems, agricultural production etc.