Which of the following statement is correct? a. meselson and stahl used radioactive isoto pe of n. b. klenow fragment in dna pol i has 53' exonuclease property.

Which of the following statement is correct? a. Meselson and Stahl used radioactive isoto pe of N. b. Klenow fragment in DNA Pol I has 53' exonuclease property. b. C. DNA replication is semi-conservative as well as semi-discontinuous. C. d. All the statementS are correct.