3. (20 points) Consider the following addition to the code. public class MockMode extends Mode { State state; **/ * Attempts to update the state so that the operation will be allowed. */ @Override public boolean isOperation Allowed (Operation op) { if (op.requiresUpload() || op. requires Printing ( ) && } lop.requiresNozzelCleaning()) { setState(State. OPERATIONAL); return true; if (op.requiresNozzelCleaning ( ) && !op.requires Printing()) { setState(State. DIAGNOSTIC); return true; } return false; } } Is MockMode a subtype of Mode according to the Liskov Substitution Principle? What is the consequence to the design of it being or not being a subtype?