Which of the following is equal to 4 bits ........

Explanation:

Answer: (b) Nibble
 A group of four bits (half of the byte) is called a nibble, and a group of eight bits (11001010) is called a byte. A nibble is a data unit that comes before the Byte, and a kilobyte comes after it. The smallest unit of storage consisting of either 0 or 1 is called a bit. The arrangement of such 4 bits is known as a nibble.