As the value of r approaches 1, what does it indicate about the following? (a) The consistency

Question:

As the value of r approaches ±1, what does it indicate about the following?
(a) The consistency in the X-Y pairs;
(b) The variability of the Y scores at each X;
(c) The closeness of Y scores to the regression line;
(d) The accuracy with which we can predict Y if X is known.