Select one or more: a. Movement of the points A to B represents a movement along the demand curve. b. The increase in quantity demanded from 20 to 30 is due to an increase in demand. c. The increase in quantity demanded from 20 to 30 follows the Law of Demand. d. The increase in quantity demanded from 20 to 30 follows the Law of Supply. e. The increase in quantity demanded from 20 to 30 is due to an increase in price from $20 to $30. f. The increase in quantity demanded from 20 to 30 is due to a decrease in price from $30 to $20