With reference to the treatment of chronic Hepatitis B infection, consider the following drugs - 1. Lamivudine, 2. Alpha interferon, 3. Ribavirin, 4. Acyclovir. Which of the above drugs are useful in the treatment of chronic Hepatitis B infection ?
1 and 2 only
1 and 3 only
2 and 3 only
1, 2, 3 and 4