Step 1: Understanding the Concept: 
Quinary activities represent the highest level of economic activity. They are concerned with the creation, re-arrangement, and interpretation of new and existing ideas; data interpretation; and the use and evaluation of new technologies. They are often referred to as 'gold collar' professions and involve top-level decision making. 
Step 2: Detailed Explanation: 
Let's analyze the options in the context of this definition: 
1. Specialists: High-level specialists who conduct research or provide expert knowledge (e.g., senior scientists) are part of the quinary or quaternary sector. 
2. Consultants: High-level consultants who advise businesses and governments on strategy and innovation fall into the quinary sector. 
3. Financial Banking: This is a broad service industry. While the CEO of a major international bank would be a quinary worker, the activity of "Financial Banking" itself, which includes tellers, loan officers, and analysts, is predominantly a tertiary activity (providing financial services to the public and businesses). 
4. Policy formulators: This includes top executives in government and science who make significant decisions that affect society, which is the very definition of a quinary activity. 
Step 3: Final Answer: 
Financial Banking as a general industry is a service-based tertiary activity, whereas the other options represent the high-level decision-making and expertise characteristic of the quinary sector.