which of the following are correct Java statements for this equation

Given that

```

a) int y = a * x * x * x + 7;

b) int y = a * x * x * (x + 7);

c) int y = (a * x) * x * (x + 7);

d) int y = (a * x) * x * x + 7;

e) int y = a * (x * x * x) + 7;

f) int y = a * x * (x * x + 7);

```

```
a) int y = a * x * x * x + 7;
d) int y = (a * x) * x * x + 7;
e) int y = a * (x * x * x) + 7;
```