In 20 18, Sony introduced the intelligent dog robot for home use, which of the following sensors was used?

1. Touch sensor: located on the pet dog's nose, it can recognize the owner's touch and flapping, making the interaction between ABO and the owner more real.

2. Camera: The dog's eyes are equipped with a camera, which can capture the surrounding images for navigation and identification of owners and objects.

3, microphone: the pet dog has a built-in microphone, which can recognize the owner's voice and conduct voice interaction.