Which of the following is a valid 3-argument call to system$clustering_depth to specify a subset of columns and a filter?

• A. select system$clustering_depth('TPCH_ORDERS', '(C2, C9)')
• B. select system$clustering_depth('TPCH_ORDERS', '(C2, C9)', 'C2 = 25')
• C. select system$clustering_depth('TPCH_ORDERS', 'C2 = 25')
• D. select system$clustering_depth('TPCH_ORDERS', '(C2, C9)', 'C2 = 25', 1)

Answer: (B)

The concept being tested is how to call the function with a three-argument form: specify the table, provide a subset of clustering columns, and supply a filter expression. The subset of columns must be given in a tuple-like form such as '(C2, C9)', and the filter must be a boolean expression like 'C2 = 25'. The valid three-argument form is: select system$clustering_depth('TPCH_ORDERS', '(C2, C9)', 'C2 = 25'). This matches the required signature and proper formatting. The other options fail because they either omit the filter, place the filter in the position of the column subset, or add an extra argument beyond the three.