Which of the following must all listing agreements comply with?

The requirement for listing agreements revolves around the need for a written document to ensure clarity and enforceability in real estate transactions. While it's true that only exclusive-right-to-sell agreements are emphasized to be in writing to provide protections for agents and sellers, all listing agreements benefit from written documentation for the sake of legal clarity and reducing misunderstandings.

In many jurisdictions, including Indiana, having a written agreement helps to establish the terms of the agreement clearly, protecting all parties involved. Exclusive-right-to-sell agreements, in particular, solidify the agent's right to a commission regardless of who sells the property, which is why their existence in writing is stressed.

On the other hand, although open listings can be oral, it is advisable to have all forms of agreements documented to avoid disputes. The other answers imply varying degrees of compliance that do not reflect the essential nature of written agreements in real estate practices.