What type of calibration indicates that an item is operationally ready and requires full maintenance?

The correct answer, which indicates that an item is operationally ready and requires full maintenance, is associated with the term "Full." In the context of calibration, a full calibration is a comprehensive assessment where the equipment undergoes detailed checks and adjustments to ensure all functions are working optimally. This means that the item has been tested thoroughly and any discrepancies or deviations from standard operational parameters are addressed through maintenance efforts.

By performing a full calibration, the equipment is not only assessed for its current state but is also fine-tuned to meet operational standards. This process is crucial for ensuring that the item can perform its designated tasks effectively and reliably, which is essential in any engineering equipment context.

Inactive, not required, or special calibrations do not signify that the equipment has been thoroughly tested and made ready for operational use. Instead, these terms suggest varying degrees of status, with inactive indicating the equipment is not in use, not required often implying no calibration is needed, and special typically relating to unique or non-standard testing procedures that do not guarantee the item is ready for operational deployment. Thus, "Full" calibration remains the best choice for indicating readiness and the necessity for comprehensive maintenance checks.