Which of the following are the platform-to-target classification environments?

The classification of platform-to-target environments pertains to the different operational domains in which military platforms can engage targets. The correct answer of air, surface, and sub-surface encompasses the essential environments within military operations.

Air refers to the domain where aerial platforms, such as aircraft and drones, operate to engage targets. Surface denotes the area where naval ships and ground vehicles operate. Sub-surface addresses operations beneath the water, typically involving submarines and underwater drones. This classification effectively illustrates the various environments in which different military assets can function, allowing for strategic planning and execution of operations.

In contrast, the other options do not fully capture the significance of each domain in operational context or may mislabel one or more of them. For example, while options might recognize land and aerial environments, they may fail to account for all aspects of naval operations, which include both surface and sub-surface engagements. The inclusion of space in some options also represents a distinct operational domain not directly related to platform-to-target classification within conventional military engagements.