Given that Short and Integer extend Number directly, what type can be used to fill in the blank in the following class to allow it to compile? 

A. Object

B. Integer

C. Short

D. Number

E. None of the above

package band; interface Horn { public Integer play(); } abstract class Woodwind { public Short play() { return 3; } } } public final class Saxophone extends Woodwind implements Horn { public play() { return null; }