The correct option is 'Sort'. In LINQ to DataSet, the orderby clause is used to sort the result set based on one or more criteria. It allows you to specify the order in which the elements should appear in the result set, such as ascending or descending order.

The Entity Data Model (EDM) in Entity Framework is a conceptual model that represents the structure of data in an application independently of the database schema. It provides a higher-level abstraction over the database, allowing developers to work with entities and relationships in a more intuitive manner.

The primary purpose of the join clause in LINQ is to combine two or more sequences based on a related key. It allows for creating a combined result set from two or more collections based on a common field or property. This operation is akin to SQL JOIN operation.

The CommandType property of a command object is set to StoredProcedure when executing a stored procedure. This tells the command object that the CommandText property contains the name of a stored procedure to execute.

The Repeater control in ADO.NET relies heavily on dynamic binding to display data. Dynamic binding involves binding data to the control at runtime, allowing for flexibility in displaying different datasets without needing to modify the control's structure at design time. This makes it a versatile option for displaying various datasets in web applications.

The correct option is 'Filter'. In LINQ to DataSet, the where clause is used to filter elements from the result set based on a specified condition. It allows you to include only those elements that satisfy the specified condition.

Table Per Type (TPT) mapping strategy in Entity Framework is used for complex inheritance scenarios where each derived type is mapped to its own table, containing only the properties specific to that type. This approach ensures a normalized database schema and allows for efficient querying and data retrieval without redundancy. TPH maps all types in an inheritance hierarchy to a single table, leading to potential data integrity and performance issues. TPC maps each concrete class to its own table, resulting in redundant columns and denormalized data. TPE is not a standard mapping strategy in Entity Framework.

In a Code-First approach with Entity Framework, database schema changes are managed through migrations. When developers modify the application's data model, Entity Framework generates migration files that represent these changes. Developers can then apply these migrations to update the database schema incrementally. Entity Framework tracks the history of migrations applied to the database, allowing developers to roll back changes if needed. This approach enables developers to evolve the database schema alongside the application's data model while preserving existing data.

Data readers in ADO.NET are primarily used for reading data from the database. They provide a lightweight and efficient way to sequentially retrieve query results, allowing applications to process large datasets without the overhead of loading the entire result set into memory. While data readers excel at data retrieval operations, they are not designed for updating or modifying data in the database, as they provide read-only access to query results.

The where clause in LINQ is primarily used for filtering elements based on specified criteria, allowing developers to select only those that meet certain conditions.