I think it's ABE
When enabling MSTP, you define one or more MSTP regions. An MSTP region defines a logical domain where multiple spanning-tree instances (MSTIs) can be administered independently of MSTIs in other regions, setting the boundary for bridge protocol data units (BPDUs) sent by one MSTI. An MSTP region is a group of switches that is defined by three parameters:
Region name—User-defined alphanumeric name for the region.
Revision level—User-defined value that identifies the region.
Mapping table—Numerical digest of VLAN-to-instance mappings.
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-configuring-mstp.html
Relate the juniper doc which you shared, in the MSTP CLI
[edit ... protocols mstp]
user@switch# set configuration-name configuration-name
Therefore if we said the CLI should be "configuration-name". However, Maybe the name of this parameters call "region name"?
The correct answer is ABC by using the elimination method
see :
user
https://supportportal.juniper.net/s/article/EX-series-Switch-and-MSTP-Multiple-Spanning-Tree-Protocol?language=en_US
Region name and configuration name are basically the same.
But the question is looking for specifically for config parameter.
In config, the word used is configuration-name.
Wrong. Correct answer ABE
An MSTP region is a group of switches that is defined by three parameters:
Region name—User-defined alphanumeric name for the region.
Revision level—User-defined value that identifies the region.
Mapping table—Numerical digest of VLAN-to-instance mappings.
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