A network technician is planning to update the firmware on a router on the network. The technician has downloaded the file from the vendor`s website. Before installing the firmware update, which of the following steps should the technician perform to ensure file integrity? 

Answer options:

A. Perform antivirus and anti-malware scans of the file.
B. Perform a hash on the file for comparison with the vendor`s hash.
C. Download the file a second time and compare the version numbers.
D. Compare the hash of the file to the previous firmware update.

B