Which of the Following Statements Is/are True About the Regression

Which of the following statements is/are true about the regression equation?

A) We use the symbol Y' instead of just Y to signify that we are dealing with a predicted value, not an actual value.
B) The a in the equation shows where the regression line intersects the vertical y-axis line.
C) The b in the equation shows us the slope we would use as we draw the line moving from our starting point along the y-axis to the right as the line moves higher or lower above the various x-axis values.
D) All of these.