A user is unable to access files on a work PC after opening a text document. The text document was labeled "URGENT PLEASE READ.txt – In active folder, .txt file titled urgent please read". Which of the following should a support technician do FIRST?


A. Quarantine the host in the antivirus system.
B. Run antivirus scan for malicious software.
C. Investigate how malicious software was installed.
D. Reimage the computer.