For an Oligopolistic Firm,which of the Following Can Be Identified

For an oligopolistic firm,which of the following can be identified as a strategy?

A) Produce 10,000 units regardless of what the rivals do.
B) Advertise if the rival advertises,do not advertise if the rival does not advertise.
C) Raise the price if the rival raises the price,keep the current price if the rival lowers its price.
D) All of above.