Explanation: To enable external buyers to view products on the storefront, the objects that need to be set to "Public Read Only" access level are Order Delivery Method (B),Catalog (C), and Price Book (E). Order Delivery Method is crucial for buyers to understand shipping options; Catalog structures the product offerings and navigation; and Price Book holds the pricing details necessary for purchase decisions. Providing "Public Read Only" access to these objects ensures that external buyers can browse products, understand pricing, and comprehend delivery options without compromising other data's security or integrity. Accounts (A of a Product Code is fundamental for the indexing process itself.