Of the following, ____ would be considered as a way through which a computer virus can enter

Of the following, ____ would be considered as a way through which a computer virus can enter into a computer system. 

a) E-mail with attachments b) Downloading the data from sites c) Operating the system without antivirus software d) All of the above
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Answer :

Of the following, ____ would be considered as a way through which a computer virus can enter into a computer system. a) E-mail with attachments b) Downloading the data from sites c) Operating the system without antivirus software d) All of the above

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