The correct command to add to the script is option B, which concatenates the string 'fusion-config_' with the variable date to form the filename. This will result in a filename that includes the desired prefix followed by the current date, matching the format specified in the question.
References := For more information on scripting and automation within Cisco environments, you can refer to the Cisco Data Center Core Technologies documentation, which includes guidelines on using Python scripts for network configuration and management tasks.