The correct answer is "All of these."

Explanation:

The Pearson correlation coefficient, denoted as $r$, measures the linear relationship between two variables. Its value ranges from -1 to 1, with interpretations as follows:

1. $r \approx 1$: Indicates a strong positive correlation; as one variable increases, the other also tends to increase.
2. $r \approx -1$: Indicates a strong negative correlation; as one variable increases, the other tends to decrease.
3. $r \approx 0$: Indicates no linear correlation; the variables move independently of each other.

Thus, all the options listed describe specific cases of the Pearson correlation coefficient.