Which of the following isnot a correct designation for a sigmatropic rearrangement?

Name: Which of the following isnot a correct designation for a sigmatropic rearrangement?
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Question

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Sigmatropic rearrangements are classified by the number of atoms in the migrating group and the number of atoms in the framework that are involved in the rearrangement. A [3,1] rearrangement is not possible because it implies a migration of three atoms over one atom, which does not fit the definition of a sigmatropic shift.

Which of the Following Isnot a Correct Designation for a Sigmatropic