What Best Describes Enhanced Cost-Per-Click (ECPC)

Multiple Choice

What best describes Enhanced Cost-Per-Click (ECPC) ?

A) ECPC is a CPC bidding feature that automatically bids more aggressively in auctions more likely to result in a conversion.
B) ECPC is a Quality Score boost for advertisers using ad extensions.
C) ECPC is the discount applied to your Max CPC to determine actual CPC.
D) ECPC is a separate bid set for ad groups using the Conversion Optimizer.