The correct answer is 2 and 3 only because both Hepatitis B and HIV-AIDS can be transmitted through the sharing of contaminated needles or equipment during tattooing. These infections are bloodborne and can enter the body when non-sterile tools pierce the skin. In contrast, Chikungunya is primarily transmitted through mosquito bites and is not associated with skin-penetrating procedures, making it non-contagious through tattooing practices. Thus, awareness of safe tattooing practices is crucial to prevent the transmission of these viral infections.