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;
}}

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