CREATE TABLE table_203_752 (id DECIMAL, "rank" DECIMAL, "circuit" TEXT, "headquarters" TEXT, "screens" DECIMAL, "sites" DECIMAL)

what is the name of the circuit with the least amount of sites ?
SELECT "circuit" FROM table_203_752 ORDER BY "sites" LIMIT 1
SELECT "circuit" FROM "table_203_752" ORDER BY "sites" NULLS FIRST LIMIT 1