Which standard is designed to sustain operations for at least 24 months with possible upgrades?

The standard that is designed to sustain operations for at least 24 months with possible upgrades is the semi-permanent standard. This classification indicates a stability and longevity in its operational capabilities, making it suitable for environments where extended functionality is required while allowing for improvements and updates over time.

Temporary standards are focused on short-term applications and may not provide the necessary durability or adaptability for a span of two years. Organic standards typically refer to systems that are more flexible and adaptable, possibly at the cost of reduced longevity. Initial standards are often meant to establish a baseline for operations but are not inherently designed to sustain prolonged operations without further upgrades. Thus, the semi-permanent standard accurately reflects the need for stability over a two-year period with the potential for updates.