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单项选择题

Given the uncompleted code of a class:    
class Person { 
String name, department;    
int age; 
public Person(String n){ 
name = n;
} 
public Person(String n, int a){ 
name = n; 
age = a; 
} 
public Person(String n, String d, int a) { 
// doing the same as two arguments version of constructor    
// including assignment name=n,age=a    department = d;    
}    
} 
Which expression can be added at the "doing the same as..." part of the constructor?() 

A. Person(n,a);
B. this(Person(n,a));
C. this(n,a);
D. this(name,age);

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