Opponent of sergei bondarovich, and a Record of 2 0 had what method?
CREATE TABLE table_6647 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Round" text
)
SELECT "Method" FROM table_6647 WHERE "Opponent" = 'sergei bondarovich' AND "Record" = '2–0'
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: Opponent of sergei bondarovich, and a Record of 2 0 had what method? ### Input: CREATE TABLE table_6647 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Round" text
) ### Response: SELECT "Method" FROM table_6647 WHERE "Opponent" = 'sergei bondarovich' AND "Record" = '2–0'