Final answer:
The subject of this question is dataset features, referring to the characteristics or properties of a dataset such as the number of records and variables. Option number b is correct.
Step-by-step explanation:
The subject of this question is Data analysis dimensions, which refers to the characteristics or properties of a dataset that provide important insights into the data. In this case, the dimensions include the number of records (1000) and variables (50) in the dataset.
These dimensions are considered Dataset features that help to describe and analyze the dataset. They provide information about the structure and composition of the data.
Therefore, the correct option is Dataset features (B) as it accurately describes the dimensions of the given dataset.