CREATE TABLE table_name_90 (power VARCHAR2, class VARCHAR2, identifier VARCHAR2)

What is the power that belongs to Class A with an Identifier of CBOC-FM?
SELECT power FROM table_name_90 WHERE class = "a" AND identifier = "cboc-fm"
SELECT "power" FROM "table_name_90" WHERE "a" = "class" AND "cboc-fm" = "identifier"