Given below are two statements.
Statement I: Griffith concluded that the R strain became virulent due to the transfer of some transforming principle from the heat attenuated S strain.
Statement II: Oswald Avery, Colin MacLeod and Maclyn McCarty experiments discovered that digestion of the heat killed S strain extract with DNase inhibited transformation.
In light of the above statements, choose the correct answer from the options given below.

Griffiths experiments(1928), concluded that the R strain bacteria had somehow been transformed by the heat-killed S strain bacteria and made it virulent. Some ‘transforming principle’, transferred from the heat-killed S strain, enabled the R strain to synthesize a smooth polysaccharide coat. However, the biochemical nature of genetic material was not defined by his experiments.

Oswald Avery, Colin MacLeod and Maclyn McCarty (1933-44), conducted experiments to characterise the transforming principle.

They discovered that protein-digesting enzymes (proteases) and RNA-digesting enzymes (RNases) did not affect transformation, so the transforming substance was not a protein or RNA. 

However, digestion with DNase did inhibit transformation, suggesting that the DNA caused the transformation.

Note : DNase is a DNA digesting enzyme (protein).