What category of device is sealed by an event logger?

The correct choice of Category 3 for a device sealed by an event logger is based on the nature and function of event loggers in measurement verification. Category 3 devices typically involve parameters where data integrity and security are critical. Event loggers are designed to monitor and record specific events or conditions, ensuring that any changes or tampering can be tracked and logged accurately.

In the context of measurement verification, a sealed device indicates that once it is deployed, any physical access or modification to the device is restricted, safeguarding the data integrity. This sealing is essential for maintaining the reliability of measurements, which is critical in applications where precision is necessary, such as in legal, compliance, or commercial environments.

The other categories pertain to devices that may have less stringent requirements regarding tampering or data security, making it clear why Category 3, with its focus on event logging and device sealing, is the appropriate classification.