多选题Which two are true about has-a and is-a relationships？（）AInheritance represents an is-a relationship.BInheritance represents a has-a relationship.CInterfaces must be used when creating a has-a relationship.DInstance variables can be used when creating a has-a relationship.
多选题
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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