If the Price for a Product Is Given By $p = 6400 - x ^ { 2 }$

Multiple Choice

If the price for a product is given by $p = 6400 - x ^ { 2 }$ , where $x$ is the number of units sold, then the revenue is given by $R = p x = 6400 x - x ^ { 3 }$ . How many units must be sold to give zero revenue?

A) 6400
B) 0, 6400
C) 0, 80
D) 0