You have a class called Statistics that has a $($public$)$ method called "average" that takes an array of doubles and returns the average of the array.

Suppose you see the following line$($s$)$ of code in another file:

double$[]$ arr $=\{4\mathrm{.}0,2\mathrm{.}3,4\mathrm{.}6,1\mathrm{.}1\}$;

double avg $=$ Statistics.average$($arr$)$;

System.out.println$("$the average is: $"+$ avg$)$;

What listed below must be true about the average method?

Group of answer choices

average must be a private method

average must be a static method $($no instance of the Statistics class$)$

average is being called on an instance of the Statistics class

the code won't compile