Huawei network devices use file extensions to distinguish software images, patches, configuration files, and other packages. A patch package uses the .pat extension, so test.pat is the only option that represents a Huawei patch file. A .cc file is normally associated with a VRP system software package rather than a patch. Configuration data is stored in supported configuration formats and is not identified by the .pat extension. An administrator can transfer the patch file to the device by FTP, SFTP, or another supported file-transfer method and then activate or load it according to the platform ' s patch procedure. The purpose of a patch is to correct defects or vulnerabilities without necessarily replacing the complete system software package. Because the question asks specifically for the file that can be uploaded as a patch to remediate a security vulnerability, the filename ending in .pat is the technically correct selection. The source answer B is therefore consistent with Huawei Datacom file-management conventions.