Question: CCTV can use fixed focal length or varifocal lenses. Which of the following correctly describes the lenses used in CCTV?
A. A fixed focal length lens allows you to move between various fields of view with a single lens.
B. To cover a large area and not focus on specific items, use a large lens opening.
C. An auto-iris lens should be used in an area with fixed lighting.
D. A shallow depth of focus allows you to focus on smaller details.

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