In which of the following is $DNA$ the genetic material?

Who isolated protein and nucleic acid from nuclein?

The unequivocal proof that $DNA$ is the genetic material came from the experiments of:

What are the properties of genetic material $(DNA/RNA)$?

If $DNA$ contained sulphur instead of phosphorus and proteins contained phosphorus instead of sulfur,what would have been the outcome of Hershey and Chase experiment?

Analyze the following experimental steps performed by Frederick Griffith:
$I - R$ strain $\rightarrow$ injected into mice
$II - S$ strain $\rightarrow$ injected into mice
$III - S$ strain (heat-killed) $\rightarrow$ injected into mice
$IV - S$ strain (heat-killed) $+ R$ strain (live) $\rightarrow$ injected into mice
In which of the above stages will the mice remain alive?