Which of the following is the proper sequence for when a firm should develop a business model?
选项：

A: Preparation of the business model, initial validation of the business idea, opportunity recognition
B: Initial validation of the business idea, establishing a growth plan, preparation of the business model
C: Initial validation of the business idea, preparation of the business model, fleshing out the operational details of the firm
D: Opportunity recognition, fleshing out the operational details of the firm, preparation of the business model
E: Opportunity recognition, preparation of the business model, establishing a growth plan for the firm