A virus which deceive the user by acting as a legitimate file.
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A Trojan virus

Explanation:

It acts like a bona fide application or file to trick you. It seeks to deceive you into loading and executing the malware on your device

your answer is confidentiality

the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses