CREATE TABLE table_204_538 (id DECIMAL, "pos." DECIMAL, "driver" TEXT, "co-driver" TEXT, "car" TEXT, "time" TEXT)

which driver had the slowest time in finishing this race ?
SELECT "driver" FROM table_204_538 ORDER BY "pos." DESC LIMIT 1
SELECT "driver" FROM "table_204_538" ORDER BY "pos." DESC NULLS LAST LIMIT 1