Any concrete subclass that extends class Foo:

```
public abstract class Foo {
private int a;
public int b;
public Foo(int aVal, int bVal) {
a = aVal;
b = bVal;
}
public abstract int calculate();
}
```

a. Must implement a method called calculate.
b. Will not be able to access the instance variable a.
c. Neither (a) nor (b).
d. Both (a) and (b).


d. Both (a) and (b).

Computer Science & Information Technology

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