Final Answer:
Structural mitigation strategies include the following EXCEPT: D. Relocation.
Step-by-step explanation:
Structural mitigation strategies aim to minimize the impact of natural disasters on structures and communities. Elevations involve raising structures above potential flood levels to avoid inundation, and building retrofits focus on reinforcing existing structures to withstand earthquakes, hurricanes, or other hazards. Safe rooms are specifically designed shelters within a building to protect occupants during extreme events, such as tornadoes or hurricanes.
However, relocation is not a structural mitigation strategy; it is a non-structural approach. Relocation involves moving structures or communities away from high-risk areas, such as floodplains or coastal zones, to safer locations. While it is a valuable risk reduction strategy, it falls under the category of non-structural or land-use planning measures rather than structural mitigation.
Option D is the answer.