Auser clicked an email link that led to a website than infected the workstation with a virus. the virus encrypted all the network shares to which the user had access. the virus was not deleted or blocked by the company's email filter, website filter, or antivirus. which of the following describes what occurred?
a. the user’s account was over-privileged.
b. improper error handling triggered a false negative in all three controls.
c. the email originated from a private email server with no malware protection.
d. the virus was a zero-day attack.

D

Explanation:

A zero-day vulnerability is a computer-software vulnerability that is unknown to those who would be interested in mitigating the vulnerability. Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network. An exploit directed at a zero-day vulnerability is called a zero-day exploit, or zero-day attack.

since it can be assumed that what aslam is making is a template by compiling all the commonly used excel formatting in several worksheets in an excel document, aslam can choose to save it using the .xltx or .xltm format instead. thus, aslam can distribute the templates he has made to his team members in an easier manner.