The correct answer is C. Confidentiality of information
Step-by-step explanation:
The Confidentiality of information is a principle of ethical and professional code that implies sensitive information of clients or others is protected appropriately and therefore is not shared with a third party or used for other purposes. In the case presented, the computer professional violated this principle because he had sensitive information and he shared it with a third party which means the information of other people was not protected appropriately which is against ethics because this information can be used maliciously.