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).
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