What letters appear next to a route, which is automatically created by RouterOS when user adds a valid address to an active interface?

Consider the following diagram. We want to communicate from a device on LAN1 to a device on LAN2.
Assuming that all necessary configurations are already included on R2, which of the following configurations in R1 would enable this communication?

When adding a static route, you must always ensure that you add both the gateway and the interface.

Which protocol does Ping use?

What command will display the line, protocol, DLCI, and LMI information of an interface?