Which are true about instance variables of a class (check all that apply): Group of answer choices They should usually be declared private. Member instance methods of the same class must use this. before their names in order to access them. Member instance methods of the same class must use mutator methods to modify their values. Mutators should protect them by filtering bad parameter values before assigning those values to them. Loop counters and other helper variables should be declared as instance variables so that such counters and helpers don't have to be re-declared local to every member method, individually.

Write a program that uses a two-dimensional array to store the highest and lowest temperatures for each month of the year. the program should output the average high, average low, and the highest and lowest temper- atures for the year. your program must consist of the following functions: a. function getdata: this function reads and stores data in the two- dimensional array. b. function averagehigh: this function calculates and returns the average high temperature for the year. c. function averagelow: this function calculates and returns the aver- age low temperature for the year. d. function indexhightemp: this function returns the index of the highest high temperature in the array. e. function indexlowtemp: this function retur