What must all door-to-door sales contracts include?

The requirement for door-to-door sales contracts to include the name and address of the seller ensures transparency and accountability in the sales process. By having this information readily available, consumers can verify the legitimacy of the salesperson and the business they represent, which is crucial for consumer protection. This helps to ensure that buyers know who they are entering a contract with, providing them with the ability to follow up or take action if necessary in relation to the services promised or if any disputes arise.

The other options do not align with the necessary requirements for door-to-door sales contracts. For instance, collecting the buyer's social security number or bank account details is not standard practice for such contracts, as these details could lead to privacy concerns and potential identity theft. Similarly, while a detailed list of materials to be used is often important in sales agreements, it is not mandated that this specific detail be included in every door-to-door sales contract across the board. In focusing on seller identification, the law aims to protect consumers from unscrupulous practices.