问题：

[单选]

1. public class Person { 
2. private String name； 
3. public Person（String name） { this.name = name； } 
4. public boolean equals（Person p） { 
5. return p.name.equals（this.name）； 
6. } 
7. } 
Which is true？（） 

A .  The equals method does NOT properly override the Object.equals method.
B .  Compilation fails because the private attribute p.name cannot be accessed in line 5.
C .  To work correctly with hash-based data structures， this class must also implement the hashCode method.
D .  When adding Person objects to a java.util.Set collection， the equals method in line 4 will prevent duplicates.