Final answer:
The three open body positions are b) 1/4 left and right, full front, which include body angles and orientations that communicate with the audience effectually in performing arts.
Step-by-step explanation:
The three open body positions are b) 1/4 left and right, full front. These positions refer to how an actor or performer stands in relation to the audience or camera, and they are essential for creating the best visual effect and engagement with the audience.
In the 1/4 left and right positions, the performer stands at a slight angle, which allows more of their body to be seen by the audience while still offering a sense of directionality. The full front position is where the performer faces the audience directly, making this the most engaging and open position. Positioning the body in different ways on stage or in front of the camera is critical for visual storytelling and can communicate a lot about a character's intentions, openness, or attitude.