When setting up campaigns, which of these procedural concepts are crucial for ensuring that ads are correctly attached to placements?

When setting up campaigns, which of these procedural concepts are crucial for ensuring that ads are correctly attached to placements?
A . Using the same ads across all placements to save time
B . Matching the ad content with the placement’s audience characteristics
C . Reviewing placement performance data to guide ad attachment
D . Attaching as many different ads as possible to each placement

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Answer: BC