Consider the following code segment.
num += num;
num *= num;
assume that num has been previously declared and initialized to contain an integer value. which of the following best describes the behavior of the code segment?
a: the value of num is two times its original value.
b: the value of num is the square its original value.
c: the value of num is two times the square of its original value.
d: the value of num is the square of twice its original value.
e: it cannot be determined without knowing the initial value of num.