In Python, which of the following indicates an octal number?

In Python, to represent an octal number, the prefix used is '0o' or '0O'. This notation specifically indicates that the number is in base 8, which is what octal signifies. Therefore, when you see a number starting with '0o', Python recognizes it as an octal value, allowing for proper interpretation and manipulation of that number in calculations.

The other prefixes signify different numerical bases: '0x' is used for hexadecimal (base 16) numbers, '0d' is not a valid prefix in Python (as no prefix is needed for decimal numbers), and '0b' is used for binary (base 2) numbers. Understanding these prefixes is essential for correctly working with different numerical systems in Python programming.