The Reserve Price Serves Two Related Purposes

The reserve price serves two related purposes.One of them is to elevate the final bid price.The other one is _____.

A) to raise the seller's personal value for the item
B) to protect the seller from auctioning the good for too low a price
C) to ensure that the highest bid remains identical for any type of auction
D) to reach equilibrium bid-price level in case of asymmetric distribution of private value
E) to keep the bid-price level within the maximum private value in the auction