Final answer:
In post-production, video editing for online playback takes place, with the director selecting the best takes for the final cut. This is separate from the production tasks like filming b-roll and setting up lights.
Step-by-step explanation:
The task that typically occurs in post-production is A) Editing for online playback. During this phase of video production, the director assumes control, shaping the narrative by selecting the best takes and arranging them to convey the intended story. Actors are not present during this time. Contrarily, tasks B) Filming b-roll, C) Setting up key lights, and D) Capturing a two-shot are actions undertaken during production, when footage is being captured.
This is when the director goes through all the shots filmed on set, selects the best ones, and edits them to create the final sequence. It is during this phase that the movie is pieced together and the majority of shots don't make the final cut.