How can one best describe the nature of negative and positive correlations? a. The moral or practical value of a correlation cannot be derived solely from its direction (positive or negative). b. Negative correlations always indicate a decrease in one variable leads to an increase in the other, while positive correlations indicate both variables move in the same direction. c. Positive correlations imply direct causation, while negative correlations imply inverse causation. d. Negative correlations are always detrimental, while positive correlations are beneficial