Mary is helping a computer user who sees the message "Your personal files on your computer are encrypted! To obtain the private keys for this computer, which will automatically decrypt files, you will need to pay $400$ USD $/400$ EUR $/$ similar amount in another currency" appear on his computer screen. According to the scenario, this is an example of which of the following? 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 Availability option B Confidentiality option C Integrity option D Nonrepudiation