Final answer:
The correct answer is d) I and II, as it's not best practice in Power BI to have spaces in column names or to use abbreviations, which can lead to confusion and complexity when interpreting data.
Step-by-step explanation:
The correct answer is option d) I and II. In Power BI, it is not considered best practice to rename columns to have spaces in them (I) or to abbreviate column names (II). Spaces in column names can cause issues when writing DAX formulas, as each word needs to be bracketed, making the overall expression more cumbersome to read and write. Abbreviations can make column names unclear, especially when the abbreviations are not standard or well-known, leading to confusion for users trying to interpret the data.
On the other hand, replacing values that have integers with human-readable results (III) can be considered a best practice, as it makes data more understandable and user-friendly. Therefore, options I and II are not best practices for naming conventions while option III is generally considered a good practice.
In Power BI, it is not considered a best practice to rename columns to have spaces in them (option I) or to abbreviate column names (option II). Using spaces in column names can make it difficult to reference the columns in formulas or calculations, and abbreviations can lead to confusion and make it harder to understand the data.
Additionally, having human-readable results is important for clarity and understanding, so replacing values that have integers with human-readable results (option III) is a recommended best practice.