Which of the following statements is $NOT$ true for the Hershey and Chase experiment performed for the confirmation of genetic material?

• A
  They worked with bacteriophages and $E. coli$ bacteria.
• B
  They used radioactive elements like phosphorus $^{32}P$ and sulfur $^{35}S$.
• C
  Only radioactive phosphorus was found inside the infected $E. coli$ cells.
• D
  Their experiment proved that $DNA$ is the genetic material.