Final answer:
The key signature for E♭ Major (Concert G♭ or F#) is actually 6 flats or 6 sharps, not any of the options provided in the question. This is because the E♭ Major scale includes B♭, E♭, A♭, D♭, G♭, and C♭, while the F# Major scale includes F♯, C♯, G♯, D♯, A♯, and E♯.
Step-by-step explanation:
The key signature for E♭ Major (Concert G♭ or F#) is 6 flats when written as E♭ Major itself, which includes B♭, E♭, A♭, D♭, G♭, and C♭. However, when we reference the key signature for Concert G♭, it's actually 6 flats as well, which are the same as for E♭ Major. Conversely, if we refer to Concert F#, the key signature changes to 6 sharps, which include F♯, C♯, G♯, D♯, A♯, and E♯. Therefore, the correct answer to the question is not directly provided in the options given, as the accurate number of flats or sharps in the key signatures for E♭ Major/Concert G♭ or F# is 6, not 4 flats, 3 sharps, 2 flats, or 1 sharp.