Viruses Are Isolated from Wild TypeE $\lambda$ These Viruses Are Used to Infect a Gal^- Strain of Infected

Multiple Choice

Viruses are isolated from wild typeE.coli cells that have been infected with wild type $\lambda$ .These viruses are used to infect a gal^- strain of E.coli. A few bacterial colonies that grow on minimal galactose are obtained while no bacteria are obtained in cells that are not infected.What has happened?

A) A $\lambda$ gal⁺ phage was generated
B) Reversion mutations have occured.
C) The bacteria underwent conjugation with a gal⁺ strain
D) The bacgteria underwent transformation with a wild type