Consider the following interface.

public interface TwoDshape

$1$

double getarea$()$:

double getperimeter$()$;

s

Which of these classes correctly implements the interface?

I.

public class square implements TwoDshape

$\{$

int sideLength;

public square$($int sLen$)$

$\}$

sideLength $=$ sLen;

$\}$

public int getarea$()$

$\{$ return sideLength $*$ sideLength; $\}$

public int getperimeter$()$

$\}$

$\{$ return $4*$ sidelength; $\}$

II$.$

public class square implements TwoDShape

$1$

int sideLength;

public square$($int sLen$)$

q

sideLength $=$ sLen;

$\}$

public double getarea$($int slen$)$

$\{$ return sLen $*$ sLen; $\}$

public double getperimeter$()$

$\}$

$\{$ return $4*$ sideLength; $\}$

III. public class Square implements TwoDShape

$1$

int sidelength;

public square $($int sLen$)$

$1$

sideLength $=$ sLen;

$\}$

public double getarea$($int sLen$)$

return sLen $*$ sLen; $\}$

public double getarea$()$

return sidelength $*$ sidelengthi $\}$

public double getperimeter$()$

$\}$

$\{$ return $4**$ sideLength; $\}$

$($A$)$ I only

$($B$)$ II only

$($C$)$ III only

$($D$)$ I and II only