Step 1: Understanding the Concept: 
The question asks to identify the economic sector defined by working with information and knowledge. 
Step 2: Detailed Explanation: 
Let's review the economic sectors: 
    
 Primary Activity: Involves extracting raw materials from nature (e.g., farming, mining).
    
 Secondary Activity: Involves processing raw materials into finished goods (e.g., manufacturing, construction).
    
 Tertiary Activity: Involves providing services to consumers and businesses (e.g., retail, transport, healthcare).
    
 Quaternary Activity: This is an advanced sub-sector of tertiary activities. It is centered on knowledge and information. This sector involves activities like the collection, production, and dissemination of information. Examples include research and development (R \& D), information technology (IT), media, consulting, and education. This perfectly matches the question's description.
Step 3: Final Answer: 
The activities related to information and knowledge belong to the Quaternary sector.