Final answer:
Option (a) is the correct answer. Mπ and Aπ represent different mathematical constants.
Step-by-step explanation:
Option (a) is the correct answer. Mπ and Aπ represent different mathematical constants. Mπ refers to the mathematical constant pi (π), which represents the ratio of a circle's circumference to its diameter. Aπ is not a commonly used mathematical constant and does not have a specific meaning or value.