Which ad format typically has the lowest CPM among InStream video ads and can also serve more frequently especially on mobile devices?

Which ad format typically has the lowest CPM among InStream video ads and can also serve more frequently, especially on mobile devices?

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–Which ad format typically has the lowest CPM among InStream video ads and can also serve more frequently, especially on mobile devices?– –Bumpers– —Masthead— –Discovery TrueView– –TrueView InStream–