The first parameter of product is 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 product intends to change its value.
b. for efficiency, not because any change is intended.
c. because objects cannot be passed by value.
d. because the first parameter is strictly an input parameter.


a. because product intends to change its value.

Computer Science & Information Technology

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