The statement that a digital signature is "an electronic method of signing an electronic document and ensuring that the original content is unchanged" accurately captures the essence of digital signatures. Digital signatures use cryptographic techniques to provide not only authentication of the signer but also integrity of the document, ensuring that any alteration to the signed content can be detected. In the context of UPSC Prelims GS Paper I, understanding digital signatures is crucial, as they play a significant role in electronic governance and cybersecurity, reflecting the broader themes of technology's impact on society.