Answer :
The option which offers more reliable antivirus protection is an installation of: B) antivirus software on the mail server.
What is an antivirus?
An antivirus can be defined as a software application that is designed and developed to prevent, scan, detect, delete and protect a computer from viruses and malwares that are capable of infecting and destroying both system and user files.
In this context, the option which offers more reliable antivirus protection is an installation of antivirus software on the mail server, rather than on user PCs.
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