D sus2/C
The D sus2 chord consists of the D (Perfect unison), E (Major second) and A (Perfect fifth) notes, with C as the bass note.

How to play the D sus2/C chord
- Play C as the lowest bass note in the left hand
- Find D (Root) on the piano keyboard
- Add E (Major second) — 2 semitones above D
- Add A (Perfect fifth) — 7 semitones above D
- Press all 4 notes simultaneously to sound the D sus2/C chord