To implement Row-Level Security (RLS) correctly, three components are essential in this code:

1. BOX 1: SCHEMABINDING The inline table-valued function used as a security predicate must be created with the WITH SCHEMABINDING option. This binds the function to the database objects it references, preventing a user from dropping or altering the underlying table, which would break the security policy.
2. BOX 2: USER_NAME() The function's logic must filter data based on the user executing the query. The @Author parameter receives the value of the AuthorEmail column from the table. This value is then compared against the current user's database name, which is retrieved using the built-in USER_NAME() function.
3. BOX 3: AuthorSales The ON clause of the CREATE SECURITY POLICY statement specifies the table to which the FILTER PREDICATE is applied. The policy passes the AuthorEmail column from this table to the function. Therefore, the target object is the AuthorSales table.

Microsoft. (n.d.). Row-Level Security. SQL Server Documentation.

Location: Section "Use Case: Filter rows based on the current user".

Justification: This official documentation provides a direct example of an RLS implementation that filters based on the current user. The example explicitly shows the creation of an inline, schema-bound function (WITH SCHEMABINDING) and the use of WHERE @UserName = USER_NAME() as the predicate logic, directly supporting the answers for BOX 1 and BOX 2.

Microsoft. (n.d.). CREATE SECURITY POLICY (Transact-SQL). SQL Server Documentation.

Location: "Syntax" and "Examples" sections.

Justification: This document details the syntax for creating a security policy. It confirms that the ADD FILTER PREDICATE clause is followed by the function call and then the ON [ schema_name. ] object_name clause. This object_name is the table being protected, which corresponds to AuthorSales in BOX 3.

Microsoft. (n.d.). CREATE FUNCTION (Transact-SQL). SQL Server Documentation.

Location: Arguments > SCHEMABINDING.

Justification: This page confirms the requirement for BOX 1. It states: "The function must be schema-bound to be used as a predicate function in a security policy." This makes SCHEMABINDING a mandatory selection.