Consider the classes below, declared in the same file:
```
class A {
int a;
public A() {
a = 7;
}
}
class B extends A {
int b;
public B() {
b = 8;
}
}
```
Which of the statements below is false?
a. Both variables a and b are instance variables.
b. After the constructor for class B executes, the variable a will have the value 7.
c. After the constructor for class B executes, the variable b will have the value 8.
d. A reference of type A can be treated as a reference of type B.
D
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