Which type of mutation converts a nucleotide to an alternative structure with the same composition but a slightly different placement of rare, less stable hydrogen bonds that cause base-pair mismatch?

Question

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A tautomeric shift occurs when a nucleotide temporarily switches between its keto and enol forms, which alters its hydrogen bonding patterns and can lead to base-pair mismatch. This type of mutation is a common cause of point mutations. Depurination, deamination, transition, and transversion all involve more significant changes to the nucleotide structure, such as the loss or substitution of a base, and do not necessarily involve altered hydrogen bonding patterns.

Which Type of Mutation Converts a Nucleotide to an Alternative