| Answer C is correct. Sequencing the physical data requires the use of a clustered index. A primary key does not have to have a clustered index assigned to it. For more information, see the following sources: Chapter 2, "Creating Database Objects" SQL Server 2005 Books Online: "SQL Server Database Engine, Designing and Creating Databases, Indexes, Understanding Indexes" "Index Tuning Recommendations," http://msdn.microsoft.com/library/default.asp?url=/library/en-us/optimsql/odp_tun_1_6583.asp Within MSDN Library, go to MSDN Home, MSDN Library, Servers and Enterprise Development, SQL Server, SQL Server 2000, Database Design, Physical Database Design, Index Tuning Recommendations.
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