Option D provides the most optimized and correct solution. Using 'CROSS APPLY FLATTEN' (or
`LATERAL FLATTEN' which is equivalent) efficiently un-nests the `items' array. Filtering by =
2023' before the 'FLATTEN' operation can significantly improve performance by reducing the number of rows processed by the FLATTEN' function. Option A is syntactically correct, however CROSS APPLY is preferrable to use for readability. Option B is incorrect. It attempts to use array slicing syntax which is not valid for summing the prices of all items within the array. Option C is incorrect. The is unnecessary as the 'item' is already a JSON object. The correct syntax is
'item.value' when using Option E is invalid syntax. The FLATTEN function is not valid inside SUM.