Which of the following is NOT a characteristic of public service announcements?

Public service announcements (PSAs) are designed to inform and educate the public about important issues and encourage positive actions within the community. The key characteristic of PSAs is that they aim to benefit the community rather than promote commercial products. Therefore, the option stating that they typically aim to sell a product is not a characteristic of PSAs. Instead, the essence of PSAs lies in their focus on social issues, public health, safety, and welfare.

In contrast, the other options accurately describe PSAs. They are indeed brief and focused messages, allowing them to effectively convey essential information in a concise manner. PSAs also often address various social issues, such as health awareness campaigns, environmental conservation, or public safety, aligning with their purpose of promoting the well-being of the community.