A.String[ ]

B.String

C.Character

D.char

A.Insert Comparator<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

B.Insert Comparator<Person> on line 1.
Insert
public int compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2.

C.Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

D.Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2.

A.23

B.12

C.123

D.13

A.Option D

B.Option B

C.Option C

D.Option A

A.A is a subtype of B.

B.A cannot be final.

C.B cannot be abstract.

D.A cannot be abstract.

E.B is a subtype of A.

F.B cannot be final.