Refer to the exhibit. Router R13 is operating in Level 1 / Level 2 mode. A network engineer with an employee ID: 5209:82:636 must change the IS-IS cost of the route IP address 10.212.124.1 to 90…

`metric-style isis wide` is a global IS-IS process command to enable wide metrics, not a command to set an interface's metric directly with a value under the interface configuration.

`metric cost` is not the standard IS-IS command syntax for setting an interface metric; the correct command is `isis metric`.

While `isis metric 80` is syntactically correct for setting an interface metric, the desired cost specified in the question is 90, not 80.

The command `isis metric 90` under interface Gi1/1/1 on R12 correctly sets the IS-IS interface metric to 90. If R12 is the advertising router for 10.212.124.1 (e.g., if it's a connected or loopback interface on R12), and R12 has `metric-style wide` configured globally, then this will update the route's cost with the specified value via TLV 128.