In an experiment done by Griffith, it was found that when virulent capsulated smooth 'S' bacteria were injected into healthy mice, the mice dies of pneumonia. When mice were injected with non virulent 'R' forms of same bacteria, they survived and did not die to pneumonia. In another case when S-forms were killed by heating at above `60` and injected, rats did not get pneumonia, but when killed, s-forms and R-forms of bacteria were mixed and injected, the rats suffered from pneumonia and died. which one of the following conclusions can be drawn from the above experiment?

Options

A. Proteins from heat killed S strain made R strength virulent
B. RNA from heat killed S strain made R strain virulent
C. Both DNA and RNA from heat killed strain transformed the R strain and made it Pathogenic
D. DNA from heat killed S strain transform the R strain and made it virulent