What time is indicated by "midnight" in a 24-hour format?

In a 24-hour format, "midnight" is indicated as 0000 hours. This representation signifies the start of a new day, marking the transition from one day to the next. Essentially, 0000 is the equivalent of 12:00 AM in a 12-hour clock system, representing the very first minute of the day.

The other options represent different times throughout the day. For example, 1200 corresponds to noon, or 12:00 PM, which occurs halfway through the day. The time 2400 is often used in various contexts to refer to the end of a day, but it is generally more reliable to use 0000 to denote midnight. Lastly, 2000 corresponds to 8:00 PM, which falls well into the evening hours. Hence, when indicating midnight accurately in a 24-hour format, 0000 is the correct representation.