Final answer:
Military time is correctly expressed in four digits without colons, where the day is divided into 24 hours from 00:00 to 23:59, commonly used in various professional fields to avoid AM/PM confusion. So, the given statement is 1. true.
Step-by-step explanation:
The statement about military time is 1. true. Military time is indeed expressed in four digits, and no colons are used to separate hours and minutes. In the 24-hour time system, also known as military time, the day runs from midnight to midnight and is divided into 24 hours, from 00:00 (midnight) to 23:59 (one minute before the next midnight).
For example, 1:00 PM in regular time is 1300 in military time, and 11:00 PM is 2300. This system is useful for avoiding ambiguity between AM and PM times, and it is widely used in various contexts like the military, aviation, computing, and emergency services.