Refer to the exhibit. An engineer must create a manually triggered EEM applet to enable the R2 router interface and assign an IP address to it. What is required to complete this configuration?

The IP address configuration syntax `ip add 172.16.1.1 0.0.0.255` is incorrect; a subnet mask (e.g., 255.255.255.0), not a wildcard mask, is typically used for the `ip address` command.

`event manager session cli username` is for configuring the user context under which the EEM applet executes CLI commands, not for defining the applet's trigger type.

`event oir` triggers the applet based on an Online Insertion and Removal event, which is an automatic trigger, not a manual one as required by the question.

The command `event none sync yes` defines an EEM applet that is not triggered by a specific event but rather manually initiated, and `sync yes` ensures the applet runs synchronously, waiting for its completion before returning control. This is the correct configuration for a manually triggered EEM applet, enabling on-demand execution.