The distance between pixels p and q, the pixels have a distance less than or equal to some value of radius r, form a square centred at (x,y) is called :

The distance between pixels p and q, the pixels have a distance less t

1.	The distance between pixels p and q, the pixels have a distance less than or equal to some value of radius r, form a square centred at (x,y) is called :
A.	Euclidean distance
B.	Chessboard distance
C.	City-Block distance
D.	None of the Mentioned
Answer» C. City-Block distance