Which of the following one is used as a biosensor?

Various materials and technologies are employed in biosensors, including enzymes (for enzymatic biosensors), antibodies (for immunosensors), and nucleic acids (for DNA biosensors). Additionally, electrochemical sensors, piezoelectric sensors, and optical sensors are widely used for specific detection applications. The choice of biosensor type depends on the target analyte and the required sensitivity and specificity for the application.