编写正确的 SQL 语句，选择字段 year 值小于 1970 的所有记录。
SELECT * FROM cars WHERE @(11);
SELECT * FROM cars WHERE year < 1970;
SELECT * FROM cars WHERE year<1970;
SELECT * FROM cars WHERE year< 1970;
SELECT * FROM cars WHERE year <1970;
SELECT * FROM cars WHERE year < '1970';
SELECT * FROM cars WHERE year<'1970';
SELECT * FROM cars WHERE year< '1970';
SELECT * FROM cars WHERE year <'1970';