Final answer:
The 'open peril' 'all risk' policy in commercial property insurance is the Special Form policy.
Step-by-step explanation:
The commercial property policy that is an 'open peril' 'all risk' policy is the Special Form policy.
This type of policy provides coverage for all risks except those specifically excluded in the policy. In other words, it covers all perils unless they are specifically listed as exclusions in the policy documents.
For example, if a business has a Special Form policy and its property is damaged by a fire, the policy will provide coverage for the fire damage unless fire damage is specifically excluded in the policy documents.