Number systems with different bases such as binary (base-2), octal (base-8), decimal (base-10), and hexadecimal (base-16), are all used to view and represent digital data. Which of the following is NOT true about representing digital data?
1) Binary is a base-10 number system.
2) Octal is a base-8 number system.
3) Decimal is a base-10 number system.
4) Hexadecimal is a base-16 number system.