A marketing firm decides to purchase media time in an attempt to sell its new product. After purchasing approximately 1 million dollars of time, it has noticed no impact on the sales of the product. However, at 3 million, a substantial increase is shown. This might best be explained by ________.
1) The marketing firm's target audience was not reached until the 3 million mark.
2) The marketing firm's advertising strategy was ineffective until the 3 million mark.
3) The marketing firm's product gained popularity only after spending 3 million on media time.
4) The marketing firm's competitors started advertising their products after the 3 million mark.