Which is a correct statement about the interaction of Discount and Advertising Channel?

Select one:

a.

The interaction effect of Discount and Advertising Channel indicates that switching Channels from A (Mail) to B (Online) has a larger effect on the number of clicks when there is a discount than when there is no discount.

b.

The interaction effect of Discount and Advertising Channel indicates that adding a discount is higher for Channel B (Online) than for Channel A (Mail).

c.

All are correct!

d.

The interaction effect of Discount and Advertising Channel indicates that adding a discount has a smaller effect for Channel A (Mail) than for Channel B (Online).