Which of the following is an example of an invalid expression in Java?

a)```
result = a + b;
```
b)```
result = (14 + 9) * 5;
```
c)```
result = ((19 + 4) - 5;
```
d)```
result = firstNum % secondNum;
```
e)```
result = firstNum / secondNum % thirdNum;
```

c```
result = ((19 + 4) - 5;
```