Final answer:
Mobile equipment may fall under the liability insurance of a business auto coverage form when operating on public roads or during loading and unloading, but the exact coverage depends on the policy's terms.
Step-by-step explanation:
Under the business auto coverage form, mobile equipment is typically defined as any type of land vehicle that is not subject to motor vehicle registration requirements and is used primarily in locations such as construction sites, or for purposes other than transportation of persons or cargo over public roads. The correct answer to the question is that mobile equipment may be covered by liability insurance when it is being operated on public roads, or when it is being loaded or unloaded. However, this does not fit any of the options A-D explicitly provided in the question; thus, it's important to review the specific policy in question to determine how it addresses coverage for liability claims related to mobile equipment.