Which floors reported data errors according to the scenario?

• A. Floors 35 and 40
• B. Floor 30 only
• C. Floors 30 and 41
• D. Floor 41 only

Answer: (C)

In this kind of scenario the key thing to identify is where the data quality indicators are flagged as errors. Look for explicit notes in the logs or measurements that say data error, invalid value, checksum fail, or any anomaly on a floor. Those flags tell you which data streams were faulty.

Here, the records show error indicators on two floors—those floors have repeated or persistent error markers across the relevant time window. Other floors either have clean data entries or no error flags at all, so they aren’t reporting data errors. Because the observed anomalies align specifically with those two floors and not with the others, they are the ones reporting data errors.

Think of it as tracing where the system reports problems rather than where you might expect problems to occur. The pattern of errors on those two floors also suggests a possible shared root cause, such as a faulty sensor or a network path affecting both floors, which is why both show issues while the rest do not.