If a monkey is trained to grab and squeeze a squeaky ball, when would mirror neurons fire? $($Select all that apply$)$ a$.$ When another monkey grabs a peanut b$.$ When the monkey correctly grabs and squeaks the ball himself c$.$ When an experimenter tosses the ball across the room d$.$ When another monkey grabs a rope toy e$.$ When the monkey sees another monkey grab and squeeze the ball, but he cannot hear the sound f$.$ When the monkey hears the squeaking of the ball