CREATE TABLE table_70111 ("City of license" TEXT, "Identifier" TEXT, "Frequency" TEXT, "Power" TEXT, "Class" TEXT, "RECNet" TEXT)

Which class has an identifier of CBUA-FM?
SELECT "Class" FROM table_70111 WHERE "Identifier" = 'cbua-fm'
SELECT "Class" FROM "table_70111" WHERE "Identifier" = 'cbua-fm'