A database is being created, and its information is being stored at the physical layer. The data being stored is the information about housing in a metropolitan area, with a primary key being the property tax id, with attributes address, square footage, school district, and neighborhood. When choosing an indexing method, the access of the data is analyzed. When the data is being written to the physical layer, the most common attribute used is the primary key. When the data is being retrieved from the physical layer, the most common attribute used is the neighborhood. Which method of indexing (primary, clustering, or secondary) should be used, and why