My p and I was discussing the meaning of this sequence
1 NT - 2 C 1 NT (15-17)
2 D - 3 D
His hand was
S KDxx
H Dxxx
D BTxxx
C -
I believe 3 D shows a stronger hand with more diamonds.
What do you believe?

Marianne
PS Can anyone link me to the discussion of opening NT with a singleton K or A?