The base of an octal number is represented by:

1. 2
2. 8
3. 7
4. None

To convert an octal number to its binary equivalent, each octal digit is expressed as

1. 3 bits form
2. 4 bits form
3. 8 bits form
4. All of them

An octal number system uses the digits from

1. 0 to 8
2. 1 to 8
3. 0 to 7
4. All of them

The base of a hexa-decimal number is represented by

1. H16
2. 16
3. 15
4. None