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i think we have 2 instance right ??

How many instances of class A does the following code create ??

A x, u, v;
x=new A();
A y=x;
A z=new A();

a true
b false
b false
b false

(a) because as i read java only can extend one class and implement many interfaces
(b) some help plz
(c) some help plz
(d) some help plz

hello please who can help me in this question

Which of the following propositions is true ?? and if false why it false ?

(a) A class can implement many interfaces but must extend a single...