To solve this problem, we need to identify which molecular diagnostic technique is most useful for early detection of diseases. Let's analyze each option:$\newline \bullet$Western Blotting Technique:$\newline$ - Western blotting is primarily used for detecting specific proteins in a sample.$\newline$ - It is not typically used for early disease detection.$\newline \bullet$Southern Blotting Technique:$\newline$ - Southern blotting is used for detecting specific DNA sequences in DNA samples.$\newline$ - It is more suited for genetic analysis rather than early disease detection.$\newline \bullet$ELISA Technique:$\newline$ - ELISA (Enzyme-Linked Immunosorbent Assay) is used to detect and quantify proteins, such as antibodies and antigens.$\newline$ - It is widely used for early detection of diseases, especially infectious diseases, by identifying specific antigens or antibodies.$\newline \bullet$Hybridization Technique:$\newline$ - Hybridization techniques involve the binding of complementary nucleic acid strands.$\newline$ - While useful in genetic studies, they are not primarily used for early disease detection.$\newline$Based on the analysis, the ELISA Technique is the most useful for early detection of diseases.$\newline$Therefore, the correct option is Option 3: ELISA Technique.