What is the purpose of configuring different levels of syslog for different devices on the network?

What is the purpose of configuring different levels of syslog for different devices on the network?

A. to set the severity of syslog messages from each device B. to control the number of syslog messages from different devices that are stored locally C. to identify the source from which each syslog message originated D. to rate-limit messages for different severity levels from each device