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Even after replication, how the modified DNA remains protected?

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Even after replication, how the modified DNA remains protected?

(a) It remains protected because of conservative mode of replication

(b) It remains protected because of semi-conservative mode of replication

(c) The mode of replication has no role to play in the protection

(d) It is again modified after replication

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This intriguing question comes from Restriction Endonuclease & Phosphatases topic in portion Basics of Genetic Engineering of Genetic Engineering

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Right option is (b) It remains protected because of semi-conservative mode of replication

The explanation: Because of the semi-conservative mode of replication, one of the DNA strands remain methylated even after replication. One methylated strand is sufficient for providing protection against cleavage by a restriction endonuclease.

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