Read the passage carefully and answer the question :

Quarternary activities involve some of the following: The collection, production and dissemination of information or even the production of information. Quarternary activities centre around research, developement and may be seen as an advanced form of services involving specialised knowledge and technical skills. The quarternary sector along with tertiary sector has replaced most of the primary and secondary employment as the basis for economic growth. Over half of all workers in developed economies are in the knowledge sector and there has been a very high growth in demand for and consumption of information. Based services from mutual fund managers to tax consultants, software developers and statisticians. Personal working in office buildings, elementary schools and university classrooms, hospitals and doctors' offices, theatres, accounting and brokerage firms all belong to this category of services.

These highest level of decision makers or policy makers perform quinary activities. These are subtly different from the knowledge based industries that the quinary sector in general deals with.

Quinary activities are services that focus on the creation, re-arrangement and interpretation of new and existing ideas; data interpretation and the use and evaluation of new technologies. Often referred to as 'gold collar' professions.

Over half of all workers in developed economies are engaged in which sectors?

Knowledge sector

The correct answer is Option (2) → Knowledge sector

The passage mentions that over half of all workers in developed economies are in the knowledge sector, which includes the quaternary and quinary sectors. These sectors are characterized by their focus on advanced knowledge and specialized skills.