Which two classes correctly override the getDepth method?

Given: Which two classes correctly override the getDepth method?

A.
public class deep extends Deeper { protected Integer getDepth(){ return 5; }}

B.
public class deep extends Deeper { public Double getDepth() { return 5d; }}

C.
public class deep extends Deeper { public String getDepth () { }}

D.
public class deep extends Deeper { public Long getDepth (int d) { return 5L; }}

E.
public class deep extends Deeper { public Short getDepth () { return 5; }}