Baltimore's Experiments to Verify the Existence of an RNA-Dependent DNA

Baltimore's experiments to verify the existence of an RNA-dependent DNA polymerase required which of the following results? (Select all that apply)

A) radiolabeled precipitate after a trichloroacetic acid treatment of viruses incubated with the reagents of a standard DNA polymerase assay
B) no radioactive precipitate after a trichloroacetic acid treatment of viruses incubated with the reagents of a standard DNA polymerase assay
C) ribonuclease sensitivity in precipitate created in the standard DNA polymerase assay
D) deoxyribonuclease sensitivity in precipitate created in the standard DNA polymerase assay
E) none of the coices is relevant