Suppose a monopolist has costs such that when output is 500 units per hour, average costs are $3.   if...

Suppose a monopolist has costs such that when output is 500 units per hour, average costs are $3.   if the monopolist is regulated by a policy of average -cost pricing, the monopolist will charge a price of 

$3 only if the quantity demaned is greater than 500 units at a price of $3

$3

$3 only if the quantity demaned is less than 500 units per hour at a price of 3

or $3 only if the quantity demaned is 500 units per hour at a price of $3