The correct answer is: A. One Unicode character.
A Unicode character is a single unit of information that can be represented by a code point. A code point is a unique number assigned to a character in a character encoding system. The Unicode Standard is a character encoding standard that assigns a unique number to every character in every language. This means that any character can be represented by a single number, regardless of the language or platform.
The Char data type is a data type that can store a single Unicode character. This means that it can store any character in any language. The Char data type is often used to store strings of characters, such as names, addresses, and phone numbers.
The other options are incorrect because:
- Option B: One ASCII character. ASCII is a character encoding standard that assigns a unique number to 128 characters. This means that the Char data type cannot store all ASCII characters.
- Option C: One bit. A bit is the smallest unit of information in a computer. It can be either 0 or 1. The Char data type is not a bit.
- Option D: One Byte. A Byte is a unit of information that is made up of 8 bits. The Char data type is not a Byte.