If the table has a clustered index, or the index is on an indexed view page, the row locator is the clustered index key for the row

The question mentions non-clustered indexes and all the options are of clustered index. Is that a typo in the question? For non-clustered index the leaf nodes contain a pointer to the actual table data. Fo clustered index the leaf nodes contain the actual table data.

SQL Server and Azure SQL index architecture and design guide https://learn.microsoft.com/en-us/sql/relational-databases/sql-server-index-design-guide?view=sql-server-ver16

When a database index is created on a column or a set of columns, the database system creates a separate data structure that organizes the indexed values in a sorted manner. This structure allows the database to quickly locate the desired data based on the indexed column's value. Think of an index as a reference guide that helps the database find relevant information without having to read every row in the table.

I found it pretty good to solve the issue of a android apps website which has some issues of database and now it pretty good working on private server you can check by click here.In conclusion, database indexes are indispensable tools for optimizing database performance and speeding up d ta retrieval operations.

The answer for the subsequent query is "If the table has a clustered index, or the index is on an indexed view page, the row locator is the clustered index key for the row."