What is the class that that won 2 stages and has a position of DNF?
CREATE TABLE table_name_20 (
    class VARCHAR,
    stages_won VARCHAR,
    position VARCHAR
)
SELECT class FROM table_name_20 WHERE stages_won = "2" AND position = "dnf"
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 class that that won 2 stages and has a position of DNF? ### Input: CREATE TABLE table_name_20 (
    class VARCHAR,
    stages_won VARCHAR,
    position VARCHAR
) ### Response: SELECT class FROM table_name_20 WHERE stages_won = "2" AND position = "dnf"