What are the settings Avast wants you to install to perform the scan while boot?

What are the settings Avast wants you to install to perform the scan while boot?
What do these settings do?

If you’re talking about the boot time scan, get more information here,
https://support.avast.com/en-id/article/132/

Basically what it says on the screen (shot attached), virus definitions to provide a more through boot-time scan.

Latest or most current virus definitions.