Which preservation level corresponds to long-term preservation (1 to 8 years)?

• A. Level 3
• B. Level 2
• C. Level 1
• D. Level 0

Answer: (A)

Preservation level describes how long protective measures are expected to last between maintenance actions. For a horizon of 1 to 8 years, you need the most robust level in this set, which is Level 3. This level is designed to support long-term preservation, so you implement durable protective measures and plan inspections and upkeep over multiple years without frequent major interventions. The lower levels cover shorter timeframes with lighter protection, which wouldn’t be appropriate for an 8-year preservation window. So Level 3 best matches the 1–8 year long-term preservation goal.