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IBM 486 sample test question

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Hi, there
Here is the question:
Referring to the diagram in Figure Interface, which of the following are true?

a) Classes "X" and "Y" are subclasses of Mortgageable.

b) Instances of "X" and "Y" can be passed as parameters declared as type Mortgageable.

c) "X" and "Y" must implement a getAppraisedValue() method.

d) There are instances of Mortgageable in the production system.

B is definitely correct. Since X and Y are not italic, should the answer be C? Anyone got 100%?
Ranch Hand
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The answers to the questions are B and C.
You are pretty confident about B , so no need to explain it.
As regards C, the reason it is correct because the classes are realizing the interface and any class realizing an interface must provide the services declared by the interface.
As the interface declares the method " getAppraisedValue()"
and in an interface, no method has an implementation
so the classes implementing this interface have to implement the methods specified by it.
Take a look at the figure again and you will see a dashed line, which is for "Realization".
Hope this helps
Muhammad Asif Abbasi
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