regard on k&b book

[ming ming]

on the self test question 1.. how come the answer is B.
it say that has a relationship always rely on instance variable...i taught it should be it always rely on reference variable?

[ming ming]

i mean chapter 2 question 1

[wise owen]

class A {
}

class B {
A a;
}

[ming ming]

is that a reference variable or instance variable??

[wise owen]

4.12.3 Kinds of Variables.