Which of the following must be included in a licensee's business advertisement?

Including the business name in a licensee's advertisement is essential for ensuring transparency and professionalism in any marketing efforts. This requirement helps consumers identify the business and differentiate it from others in the market. Additionally, the business name plays a crucial role in establishing brand identity, which is important for consumer trust and recognition.

In contrast, the other options, such as including a license expiration date, personal email address, or home address, are not standard requirements in advertisements for licensees. While some details may enhance credibility, they are not mandatory elements for compliance with advertising regulations in many jurisdictions. Thus, emphasizing the business name solidifies a licensee's professional standing and fosters consumer confidence.