no sharps or flats
D major isn't actually a note. D major is a major scale based on the note D (D natural) and the scale has two sharps (F sharp and C sharp). There isn't anything special about D major since it requires both an F sharp and a C sharp, the most 'special' scale is C major since there are no flats or sharps needed.
C major is a major scale starting from C.
The C major scale is: C, D, E, F, G, A, B, C.
The C major scale is: C, D, E, F, G, A, B, C.
The major key of the C major scale is C major, and the relative minor key is A minor.
The C major scale is the only diatonic (major) scale without sharps or flats. The notes are simply C, D, E, F, G, A, B and C.
The C major scale and its relative minor, the A minor scale. C Major.
The notes in the C major scale are C, D, E, F, G, A, and B.
The supertonic of any scale is the second degree of the scale. Therefore, the supertonic of C major is D.
c flat
The D major scale has F# and C#.
The keys are C D E F G A B, there are no key signatures in C major scale