Correct Answer: A, CTo meet the requirement of isolating management traffic in a non-default routing instance on Junos-based devices, you need to place the specific interface into a dedicated management routing instance and enable the management-instance configuration. The command 'set routing-instances mgmt_junos interface ge-0/0/0' assigns the specified interface to the mgmt_junos routing instance, ensuring it operates within this isolated environment. Additionally, 'set system management-instance' activates the management instance configuration, making it effective for the required management traffic isolation.