Answer:
2. version number
Step-by-step explanation:
It is the version number of the template that explains how old or new it is. Also. if we want to differentiate between the two versions, then we probably have the best option as a version number to find out a template. and you just need to find the version number for it. You can have four versions in a year, and hence the year is not an option either. Also, the author's name can be the same for two software, and hence the author's name cannot be counted. The file size of the two versions can be the same as well. Hence, the file size cannot be used as well.