What opponent used the Ko method, and a 6-0 record?
CREATE TABLE table_name_12 (
    opponent VARCHAR,
    method VARCHAR,
    record VARCHAR
)
SELECT opponent FROM table_name_12 WHERE method = "ko" AND record = "6-0"
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 opponent used the Ko method, and a 6-0 record? ### Input: CREATE TABLE table_name_12 (
    opponent VARCHAR,
    method VARCHAR,
    record VARCHAR
) ### Response: SELECT opponent FROM table_name_12 WHERE method = "ko" AND record = "6-0"