A) All of the listed answers are correct.
B) can direct to a YouTube channel.
C) is free of charge.
D) can direct to an external URL
Here is the Answer:
Companion banners are optional and can be omitted from in-stream video ads. If you choose to include companion banners, be aware that that they’ll display only in the context of a watch page on YouTube. They do not appear on mobile devices, embedded players, connected TVs, or on game consoles.
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