The correct answer to this question is 4. IV is a Roman Numeral, which is a part of Ancient Rome's number system. Every English number has a corresponding Roman Numeral. The first ten numbers in the English numerical system are written as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
In the Roman Numeral system, they are written as I, II, III, IV, V, VI, VII, VIII, IX, X. When it comes to the number 4; it is characterized as a natural number. There are two ways to get number four. One way is to add 2 plus 2 together. Another is to multiply 2 times 2.