Which of the following best describes a digital signature? This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option. option A A framework that proves authenticity and validation of keys as well as the people or devices that use them option B Ciphertext that has been turned into plaintext option C Plaintext that has been turned into ciphertext option D An original plaintext hash, which is encrypted with a private key and sent along with the ciphertext option E A digital certificate that is not signed by a CA but by an end user