28+ D Flat Natural Minor Scale US. Notice that the a natural minor scale has no notes with accidentals. D natural minor scale is the relative minor of f major scale.
Melodic minor scales are quite different from natural and harmonic minors as they use different notes when ascending (going up) and descending (going down).
Ab harmonic minor scale harmonized triads abm bbdim baug dbm eb e gdim. Scales you can use in the real world, created by a human guitarist. See diagrams at standard guitar. D minor and f major scales have the same flat key signature.