CREATE TABLE table_name_91 (tier VARCHAR, division VARCHAR, cup_competitions VARCHAR)

Which tier has a division of LEB 2 and Cup Competitions of Copa LEB Plata runner-up?
SELECT tier FROM table_name_91 WHERE division = "leb 2" AND cup_competitions = "copa leb plata runner-up"
SELECT "tier" FROM "table_name_91" WHERE "copa leb plata runner-up" = "cup_competitions" AND "division" = "leb 2"