In DNA fingerprinting, the hybridised strands are detected by which of the following methods?

DNA, labelled with a radioactive substance, is called a radioactive probe. The probe is a single-stranded DNA molecule that is complementary to the gene of interest in the sample under study. The probe attaches by base pairing to those restriction fragments that are complementary to its sequence after the probe hybridises, and the excess probe is washed off. This technique is called autoradiograph