Two pixels p and q having gray values from V, the set of gray-level values used to define adjacency, are m-adjacent if:
(a) q is in N4(p)
(b) q is in ND(p) and the set N4(p) ∩ N4(q) has no pixels whose values are from V
(c) Any of the mentioned
(d) None of the mentioned
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My enquiry is from Relationship between Pixels and Image Enhancement Basics topic in chapter Image Enhancement of Digital Image Processing