The correct answer is: A. Floating point number
A floating point number is a number that is stored and processed in a computer in a way that allows it to represent a wide range of values. It is represented as a number with a mantissa and an exponent. The mantissa is the part of the number that represents the value, and the exponent is the part of the number that represents the power of 10 to which the mantissa is raised.
A fixed point number is a number that is stored and processed in a computer in a way that allows it to represent a limited range of values. It is represented as a number with a sign, an integer part, and a fractional part. The sign indicates whether the number is positive or negative, the integer part represents the whole number part of the number, and the fractional part represents the decimal part of the number.
An octal number is a number that is represented in base 8. This means that each digit in the number can be one of the digits 0, 1, 2, 3, 4, 5, 6, or 7.
A decimal number is a number that is represented in base 10. This means that each digit in the number can be one of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
Therefore, the correct answer is: A. Floating point number