Which of the following is NOT a cause of loss form available on a commercial property policy?

The open causes of loss form is actually a term typically used in the context of property insurance, but it is not a specific form available under commercial property policies. The correct terminology used for loss forms in commercial property policies typically includes the basic, broad, and special causes of loss forms. These forms outline the types of risks covered under a policy.

The basic causes of loss form provides coverage for a limited set of perils, such as fire, lightning, explosion, and a few others. The broad causes of loss form expands coverage to include additional perils, offering more protection than the basic form. The special causes of loss form, often referred to as all-risk coverage, provides coverage for all perils except those specifically excluded in the policy.

Therefore, while other terms or variations may exist within the insurance industry, the open causes of loss form does not fall under the established categories recognized in commercial property policies, making it the correct choice for this question.