Most Inland Marine policies provide protection on

An open policy generally refers to a type of insurance that covers all risks unless specifically excluded, which aligns somewhat with 'all-risk' coverage. However, this term is broader and not specific to Inland Marine policies, which are distinctly characterized by their all-risk nature rather than being labeled simply as an open policy.

A retroactive form of insurance provides coverage for events that occurred before the policy was purchased. Inland Marine policies do not typically operate on a retroactive basis, as they are designed to cover risks occurring during the policy period, not prior incidents.

Named perils policies only cover specific risks explicitly listed in the policy, which is contrary to the nature of Inland Marine policies. While some Inland Marine policies may offer named perils coverage, the majority provide all-risk protection, making this choice incorrect in the context of typical Inland Marine policy offerings.