We doubt that Yann is bored. There is a very good chance that Sandra grabbed the apple. There is almost no chance that Mary picked up the milk.
It is probable that either Sandra grabbed the apple, or Yann is bored.
It is probable that either Sandra grabbed the apple, or Yann is bored.
It is highly unlikely that either Sandra grabbed the apple, or Yann is bored.
Either Sandra grabbed the apple, or Yann is bored.