Answer (C) is correct . The described condition is a symptom of a virus. Many viruses will spread and cause additional damage. Use of an appropriate antivirus program may identify and even eliminate a viral infection. Ways to minimize computer virus risk in a networked system include restricted access, regularly updated passwords, periodic testing of systems with virus detection software, and the use of anti-virus software on all shareware prior to introducing it into the network.
Answer (A) is incorrect because Running a different program as a test may cause the virus to spread and do additional damage.
Answer (B) is incorrect because Rebooting the system may cause the virus to spread and do additional damage.
Answer (D) is incorrect because Backing up hard disk files may cause the virus to spread and do additional damage.
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