What RIAA Sales Certification was awarded to the song that had a Billboard 200 Peak of 21?
CREATE TABLE table_name_1 (
    riaa_sales_certification VARCHAR,
    billboard_200_peak VARCHAR
)
SELECT riaa_sales_certification FROM table_name_1 WHERE billboard_200_peak = 21
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 RIAA Sales Certification was awarded to the song that had a Billboard 200 Peak of 21? ### Input: CREATE TABLE table_name_1 (
    riaa_sales_certification VARCHAR,
    billboard_200_peak VARCHAR
) ### Response: SELECT riaa_sales_certification FROM table_name_1 WHERE billboard_200_peak = 21