A staff member contacts the help desk because the staff members device is currently experiencing the following symptoms: Long delays when launching applications Timeout errors when loading some websites Errors when attempting to open local Word documents and photo files Pop-up messages in the task bar stating that antivirus is out-of-date VPN connection that keeps timing out, causing the device to lose connectivity Which of the following BEST describes the root cause of these symptoms? A. The user has disabled the antivirus software on the device, and the host checker for the VPN is preventing access. B .The device is infected with crypto-malware, and the files on the device are being encrypted. C. The proxy server that is used for accessing websites has a rootkit installed, and this is causing connectivity issues. D.A patch has been incorrectly applied to the device and is causing issues with the wireless adapter on the device.