Despite differences in cost of production the oligopolists win not vary the prices of their products as per which combination of the following models?
1. Collusion model
2. Cournot's model
3. Kinked Demand model
4. Price Leadership model
Select the correct option:

A. Bonus theory B. Normative theory C. System theory D. Accounting theory

A. Accounting Theory B. Pricing Decision, Policies and Practices C. Capital Management D. Profit Management

A. 1, 2 and 3 B. 2, 3 and 4 C. 1, 2 and 4 D. 1, 3 and 4

A. Profit management B. Accounting theory C. Pricing policies D. Production analysis