Which two are true about has-a and is-a relationships？（）A、 Inheritance represents an is-a relationship.B、 Inheritance represents a has-a relationship.C、 Interfaces must be used when creating a has-a relationship.D、 Instance variables can be used when creating a has-a relationship.
Which two are true about has-a and is-a relationships？（）
- A、 Inheritance represents an is-a relationship.
- B、 Inheritance represents a has-a relationship.
- C、 Interfaces must be used when creating a has-a relationship.
- D、 Instance variables can be used when creating a has-a relationship.
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