Near the electric pencil sharpener in Mr$.$ Todd's classroom is a poster of an animated pencil sharpener and three steps listed on how to properly use the sharpener: $"1)$ Use me only during independent work or break time; $2)$ I am hungry, but only feed me pencils for no longer than $5$ seconds; $3)$ Walk carefully with sharp pencils back to your seat." Of what is this an example?

Question $14$ options:

Function$-$based intervention

Structural strategy

Reminder of a classroom procedure

Mnemonic strategy