Final answer:
D-double flat and C-flat are enharmonic.
Step-by-step explanation:
True, D-double flat and C-flat are enharmonic.
Enharmonic notes are two different notations for the same pitch. In music, enharmonic notes have the same sound but are written or spelled differently. A double flat (♭♭) lowers a note by two half steps, while a flat (♭) lowers a note by one half step. Therefore, D-double flat is the same pitch as C-flat.