Jack’s setting up a Display campaign. He wants to grow as many sales as possible while makingsure that conversions, on average, don’t exceed a certain cost. Which Smart Bidding option is the best?

Jack should use Target impression share because it grows both awareness and
conversions at an assigned cost point.
Jack should use Enhanced CPC because it offers the greatest amount of control
over the bidding process.
Jack should use Maximise conversions because it doesn’t require historical
conversion data.
Jack should use Target CPA because it grows conversion volume at his target
cost-per-acquisition.