What is the CERCLIS ID of the site in Polk County, with the date 08/04/2009?
CREATE TABLE table_11972 (
    "CERCLIS ID" text,
    "Name" text,
    "County" text,
    "Partially deleted" text,
    "Deleted" text
)
SELECT "CERCLIS ID" FROM table_11972 WHERE "County" = 'polk' AND "Deleted" = '08/04/2009'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the CERCLIS ID of the site in Polk County, with the date 08/04/2009? ### Input: CREATE TABLE table_11972 (
    "CERCLIS ID" text,
    "Name" text,
    "County" text,
    "Partially deleted" text,
    "Deleted" text
) ### Response: SELECT "CERCLIS ID" FROM table_11972 WHERE "County" = 'polk' AND "Deleted" = '08/04/2009'