CREATE TABLE table_name_14 (frequency VARCHAR, class VARCHAR, identifier VARCHAR)

What's the frequency when the identifier is cbf-fm-14 having a class of A?
SELECT frequency FROM table_name_14 WHERE class = "a" AND identifier = "cbf-fm-14"
SELECT "frequency" FROM "table_name_14" WHERE "a" = "class" AND "cbf-fm-14" = "identifier"