Answer:
Option C
Step-by-step explanation:
Through number theory, the totient function of Euler lists the beneficial entities up to the certain integer n which is generally primary to n. It is described by depicting the Greek letter phi as either f(n) or f(n), and the phi feature of Euler can also be named.
The totient equation of Euler is indeed a multiplicative equation which indicates that since two values m and n remain fairly prime. It is used to describe the RSA encryption scheme. This method issued the order of a substring of multiplier integer category n.