CREATE TABLE table_name_84 (iucn VARCHAR, district VARCHAR, reserve VARCHAR)

What is the IUNC of district of Cayo and reserve of Actun Tunichil Muknal?
SELECT iucn FROM table_name_84 WHERE district = "cayo" AND reserve = "actun tunichil muknal"
SELECT "iucn" FROM "table_name_84" WHERE "actun tunichil muknal" = "reserve" AND "cayo" = "district"