John is a merchant. He has set up a LAN in his office. Some important files are deleted as a result of virus attack. John wants to ensure that it does not happen again. What will he use to protect his data from virus?
A. Backup
B. Symmetric encryption
C. Firewall
D. Antivirus
John is a merchant. He has set up a LAN in his office. Some important files are deleted as a result of virus attack. Joh
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John is a merchant. He has set up a LAN in his office. Some important files are deleted as a result of virus attack. Joh
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