Which one of the following statements is true regarding insurance ratemaking methods?
A. The loss ratio ratemaking method cannot be used to determine rates for a new type of insurance.
B. All ratemaking methods use an insurer's current rates in the calculation of new rates.
C. Insurers commonly use only the pure premium method or the loss ratio method.
D. There are many methods for adjusting an existing rate or for developing a new rate.