Suppose that the variables grade1, grade2, and grade3 are declared as follows:
int grade1 = 88;
int grade2 = 92;
int grade3 = 83;
Which of these expressions correctly calculates the average of grade1, grade2, and grade3?
A. (grade1 + grade2 + grade3) / 3
B. (grade1 + grade2 + grade3) / 3.0
C. (double) ((grade1 + grade2 + grade3) / 3)
D. (double) grade1 + grade2 + grade3 / 3.0
E. (double) grade1 + (double) grade2 + (double) grade3 / 3.0
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