To allow a user to truncate tables in a specific schema, which T-SQL statement should you complete?

To allow a user to truncate tables in a specific schema, the appropriate statement is to grant the ALTER permission on that schema. This is because truncating a table requires the ability to modify the table's structure, which falls under alter operations. By granting the ALTER permission on the specified schema, the user is given the necessary rights to execute the TRUNCATE TABLE command for any table within that schema.

Other options do not provide the correct permissions for truncating tables. Granting CONNECT permission enables the user to connect to the schema but does not allow any modifications. Granting EXECUTE permission is generally for stored procedures and functions, and granting ALTER on an object is insufficient since it refers to altering specific tables rather than everything within a schema. Hence, the ALTER permission on the schema level is the appropriate choice for enabling truncation of tables.