Shelf life assets are tracked in ES-S Mobility by which identification method?

The correct answer is the contract/lot number because shelf life assets require tracking to manage their expiration and ensure they are used or disposed of within their designated time frames. The contract/lot number is a unique identifier that allows for effective monitoring of shelf life assets in the ES-S Mobility system. This method is essential because it ties directly to the asset's production and delivery lifecycle, enabling inventory management personnel to track when items were manufactured, their expiration dates, and whether they are still within usable limits. This ensures compliance with safety regulations and management practices regarding time-sensitive materials.

Other options do not offer the same level of specificity or utility for effectively managing shelf life. For instance, the manufacturer's serial number is more focused on identifying individual items rather than groups that share specific shelf life attributes. The supply catalog number typically refers to cataloguing and listing items without a focus on shelf life management, while the batch control number might not directly relate to the unique requirements for tracking shelf life in the same systemic way as the contract/lot number does.