Given the following method, which of these method calls is valid?

```
public static void showProduct (double num1, int num2)
{
double product;
product = num1 * num2;
System.out.println("The product is " + product);
}

```

a. showProduct("5", "40");
b. showProduct(10.0, 4.6);
c. showProduct(10, 4.5);
d. showProduct(3.3, 55);

d. showProduct(3.3, 55);