The second and third parameters are passed by reference
assume that class Matrix refers to the correctly completed class of #1 and that product is a friend of class Matrix. Here is product's prototype: Function product will store in its first parameter the matrix product of its second and third parameters.
```
void product( Matrix&, const Matrix&, const Matrix& );
```
a. because they are output parameters.
b. for efficiency, not because any change is intended.
c. because objects cannot be passed by value.
d. because the programmer has made an error.
b. for efficiency, not because any change is intended.
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