What is the Southbridge when the CPU support was athlon, athlonxp, duron( socketa ), alpha21264?
CREATE TABLE table_name_56 (
    southbridge VARCHAR,
    cpu_support VARCHAR
)
SELECT southbridge FROM table_name_56 WHERE cpu_support = "athlon, athlonxp, duron( socketa ), alpha21264"
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 Southbridge when the CPU support was athlon, athlonxp, duron( socketa ), alpha21264? ### Input: CREATE TABLE table_name_56 (
    southbridge VARCHAR,
    cpu_support VARCHAR
) ### Response: SELECT southbridge FROM table_name_56 WHERE cpu_support = "athlon, athlonxp, duron( socketa ), alpha21264"