CREATE TABLE table_name_15 (result VARCHAR2, extra VARCHAR2, year VARCHAR2)

what is the result when extra is 4 x 100 m relay and the year is later than 1971?
SELECT result FROM table_name_15 WHERE extra = "4 x 100 m relay" AND year > 1971
SELECT "result" FROM "table_name_15" WHERE "4 x 100 m relay" = "extra" AND "year" > 1971