In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?

In isotropic filtering, which of the following is/are the simplest iso

1.	In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?
A.	Laplacian
B.	Gradient
C.	All of the mentioned
D.	None of the mentioned
Answer» B. Gradient

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In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?

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