What Determines Whether Defenders Are Attempting to Defeat Pass or Run Blocking?

When choosing abilities, I want the selections most likely to trigger, so I ended up with the following questions:

• Which form of blocking are my defenders trying to shed on play action?

• Which form of blocking are my defenders trying to shed on draw plays?

• Which form of blocking are my defenders trying to shed on RPO’s?

Thanks!

Play action is pass

Draw is run

Rpo is run and pass depending on your read