Juniper Exam JN0-635 Topic 7 Question 33 Discussion

https://www.juniper.net/documentation/us/en/software/junos/logical-system-security/topics/topic-map/security-zones-logical-systems.html

The primary administrator can configure a security profile for the primary logical system that specifies the maximum and reserved numbers of security zones applied to the primary logical system. The number of zones configured in the primary logical system count toward the maximum number of zones available on the device.