Answer:
Flats. For key signatures with flats, the key signature is the second to last flat. This is the key of E flat because E flat is the second to last flat in the key signature. This is the key of D flat because D flat is the second to last flat in the key signature.
Explanation:
A-flat major (or the key of A-flat) is a major scale based on A♭, with the pitches A♭, B♭, C, D♭, E♭, F, and G. Its key signature has four flats.
