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Restriction enzymes cleave the bond by which type of reaction?

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Restriction enzymes cleave the bond by which type of reaction?

(a) SN1

(b) SN2

(c) SE1

(d) SE2

The question was asked in a national level competition.

My question is taken from Restriction Endonuclease in portion Genomics : The Mapping and Sequencing of Genomes of Cytogenetics

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The correct answer is (b) SN2

For explanation I would say: The reaction is by hydrolysis of the phosphodiester bond between two sugar residues by a nucleophilic attack. Inverted product configuration shows that the substrate was inverted only once. As only bimolecular nucleophilic reaction causes only one time inversion so that is the correct option.

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