Identify the correct statements that accurately reflect the concept of retention especially in context of online businesses. Select all that apply:
- Statement A: Customer retention is solely defined by the number of new customers a company acquires each quarter.
- Statement B: An e-commerce site might define a customer as retained if they make repeated purchases each quarter, demonstrating satisfaction and engagement.
- Statement C: Retention is less important for SaaS providers than for traditional retail businesses because of the nature of subscription services.
- Statement D: Retention rate is calculated by determining the percentage of customers who remain active compared to the number at the start of the period.
Select the correct statements.