Look at the following code. Which line will cause a compiler error?

Line $1$ public class ClassA

Line $2\{$

Line $3$ public ClassA$()\{\}$

Line $4$ public int method$1($int a$)\{\}$

Line $5$ public final int method$2($double b$)\{\}$

Line $6\}$

Line $7$ public ClassB extends ClassA

Line $8\{$

Line $9$ public ClassB$()\{\}$

Line $10$ public int method$1($int b$)\{\}$

Line $11$ public int method$2($double c$)\{\}$

Line $12\}$

Look at the following code. Which line will cause a compiler error?

Line $1$ public class ClassA

Line $2\{$

Line $3$ public ClassA$()\{\}$

Line $4$ public int method$1($int a$)\{\}$

Line $5$ public final int method$2($double b$)\{\}$

Line $6\}$

Line $7$ public ClassB extends ClassA

Line $8\{$

Line $9$ public ClassB$()\{\}$

Line $10$ public int method$1($int b$)\{\}$

Line $11$ public int method$2($double c$)\{\}$

Line $12\}$

$10$

$5$

$4$

$11$