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Answer:
Computer virus
A computer virus[1] is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code.[2] When this replication succeeds, the affected areas are then said to be "infected" with a computer virus.
Computer viruses cause billions of dollars' worth of economic damage each year.[5]
In 1989 The ADAPSO Software Industry Division published Dealing With Electronic Vandalism,[6] in which they followed the risk of data loss by "the added risk of losing customer confidence."[7][8][9]
In response, free, open-source antivirus tools have been developed, and an industry of antivirus software has cropped up, selling or freely distributing virus protection to users of various operating systems.
Hey mate here is your answer hope it helps you.
Answer:
True
Because we are unknown when the virus entered our system after scanning we come to know that it was has entered our system