What is the output of the sum variable after completing the following repetition through the array? Hint: try hand executing this code using paper to track the changes in the variable's values Student struct struct student { string name; double grade; }; Program code student class 1[5]; double sum; = = class1[0].grade = 10; class1[1].grade = 15; class1[2] .grade = 15; class1[3] .grade = 20; class1[4] .grade = 15; = = = for (int i = 0; i class1; double sum; class1.push_back(10); class1.push_back(15); class1.push_back(14); class1.push_back (20); class1.push_back(16); for (int i = 0; i