At the start of setting up a B2B Commerce storefront, theAdministrator needs to configure settings that are crucial for the basic operations of the store. EnablingEnhanced Commerce Orders (B)is essential as it allows for the use of advanced order management features, including complex pricing and discountstructures, which are common in B2B transactions.Enable Zero Quantity (C)is also a key setting, especially for B2B scenarios where orders might be created as placeholders or for backorder items, allowing for zero quantity orders to be processed through the system. WhileOptional Price Books for Orders (A)andReduction Orders (D)can be important in certain contexts, they are not typically the initial settings configured during the setup process.