Multi-select problem: How does the next paragraph end?

How to measure light intensity
Understand photometers that measure lux and foot-candles.
These are units that describe the intensity of light on a surface, or. Photometers that measure this are usually what people are looking for when they want to set up a photo shoot, or test whether a room is too bright or too dim.

Choose your answer from:
(1). Familiarize yourself with photometers over other techniques. Photometers can be very versatile.
(2). Some light meters are specialized for different types of lighting. For instance, one may produce more accurate results when used to measure sodium lighting.
(3). Use an online article on how to determine lux and foot-candles. Find an online article about how to calculate lux during a flash.
(4). Measure lux by adding one pound of light at a time to the scale of a standard candle. For example, for a 4.5 lb candle, a quarter pound weight of light would make a half pound candle.
(2).