What two different approaches did the knights of labor and the american federation of labor take in building a union organization?

the knights of labor accepted only unskilled workers; the american federation of labor accepted only skilled workers.

the knights of labor accepted skilled and unskilled workers; the american federation of labor accepted only skilled workers.

the knights of labor refused to accept african american or chinese workers; the american federation of labor accepted all workers.

the knights of labor accepted workers from a single industry; the american federation