It must be safe, visible, simple, and easily understood describes a/an:

The characteristics of being safe, visible, simple, and easily understood are essential elements of an effective demonstration. Demonstrations are designed to showcase specific actions, behaviors, or procedures in a way that allows an audience to easily follow and comprehend the content being presented.

In a demonstration, safety is paramount, ensuring that participants and the audience are not at risk while observing the activity. Visibility relates to the clarity and presentation style so that all audience members can see the demonstration clearly. Simplicity ensures that the concepts or actions being demonstrated can be grasped without confusion, making the content accessible to a wide range of audiences. Lastly, it needs to be easily understood to ensure that the message is effectively communicated and retained by viewers.

On the other hand, educational programs encompass a broader range of instructional efforts that may include various components such as lectures, materials, and activities beyond just demonstrations. Public service announcements are typically brief messages intended to promote awareness and behavioral change but may not adhere strictly to the criteria of safety, visibility, and simplicity in a hands-on manner. Press releases are formal communications primarily meant to convey information to the media and may not specifically focus on engaging or educating an audience in a direct, demonstrative way.