In Java Programming Language

Given the following class and declaration is valid and compiles without error: public class Little implements Upper {...} Upper up = new Little(); Ilassume this works without error Place a t if the statement is true or the expression evaluates to true, otherwise, place an f. ONLY place at or an for the problem will be marked incorrect. Little has implemented all methods of Upper Upper is an abstract class The following will compile: Little sb = new Upper(); up instanceof Little Little is an interface Little has overridden the public String toString() method. Little is a subclass of Object Upper contains a default constructor