Which of the following is a requirement for a dealer's premises?

A dealer's premises must have a clearly visible sign identifying the registered name because this is essential for transparency and consumer protection. The presence of a visible sign ensures that customers can easily identify the business, which builds trust and accountability. It allows potential buyers to know who they are dealing with, helping to prevent fraudulent activities and ensure that the dealership operates openly and honestly.

A recognizable sign is a key aspect of lawful business practices within the automotive sales industry. This requirement not only helps in establishing the dealership's identity but also complies with regulatory standards that facilitate customer recognition and engagement. Having clear identification lowers the risk of misunderstandings or misrepresentation of the business, thus promoting a fair marketplace.

The other options, while they may be beneficial for a business, do not necessarily reflect the legal requirements for a dealer's premises. Factors like having a receptionist at all times or an online presence are not mandated for all dealers, and location in a commercial zone may vary based on local regulations but isn't universally specified as a requirement.