Final answer:
An unlicensed assistant can collect and search public records and install signs, but cannot perform tasks like representing clients which require a professional occupational license.
Step-by-step explanation:
If an assistant is not licensed, there are certain tasks they are legally allowed to perform, and others which they are prohibited from doing due to the need for occupational licenses. Occupational licenses are important as they indicate that a worker has completed the required education or passed certain tests to perform specialized tasks. These licensures are often essential for professions such as doctors, lawyers, and real estate brokers. Therefore, when considering the tasks an unlicensed assistant can perform, they can do general tasks such as collecting and searching public records and installing signs. On the contrary, they cannot represent clients, as this activity requires a professional license.