In this dataset, we can see an issue withincomplete or missing data:
Cameron Smith's "Date of Birth" field is Null, which indicatesmissing datathat needs to be filled in.
The format inconsistency in "Date of Birth" (e.g., "13-Jun" vs. "Dec 14") can also be problematic, requiring standardization.
Option A (Invalid data):Incorrect. The data is not necessarily invalid, but it is incomplete.
Option B (Redundant data):Incorrect. Redundant data means unnecessary duplication, which is not the case here.
Option C (Data outliers):Incorrect. Outliers refer to values that are extremely different from the rest of the dataset, which does not apply here.
Option D (Missing data):Correct.The "Date of Birth" field has missing values (e.g., "Null"), requiring data cleansing.
[Reference:According to the CompTIA Data+ exam objectives, handling missing data is acritical part of data quality and preprocessing techniques., , , ]
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