What is the difference of Min, Max and Last

[Alan Lim]

I am confused for the trigger expression of min, max and last.
I would like to have an alert where disk space less than 5% for 30mins. What is the difference of the below expression?
1. {Windows:vfs.fs.size[{#FSNAME},pfree].min(30m)}<5
2. {Windows:vfs.fs.size[{#FSNAME},pfree].max(30m)}<5
3. {Windows:vfs.fs.size[{#FSNAME},pfree].last(30m)}<5

Thank you

[kloczek]

https://www.zabbix.com/documentation/3.4/manual/appendix/triggers/functions