For pixels p(x, y), q(s, t), and z(v, w), D is a distance function or metric if:

D(p, q) ‚Äö√Ñ√∂‚àö¬¢‚Äö√Ñ¬¢ 0

D(p, z) ‚Äö√Ñ√∂‚àö¬¢¬¨√ü D(p, q) + D(q, z)

For pixels p(x, y), q(s, t), and z(v, w), D is a distance function or

1.	For pixels p(x, y), q(s, t), and z(v, w), D is a distance function or metric if:
A.	D(p, q) ‚Äö√Ñ√∂‚àö¬¢‚Äö√Ñ¬¢ 0
B.	D(p, q) = D(q, p)
C.	D(p, z) ‚Äö√Ñ√∂‚àö¬¢¬¨√ü D(p, q) + D(q, z)
D.	All of the mentioned
Answer» E.

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