Given a dictionary with three elements whose keys are "cat", "dog", "bluejay" (you don't what their values are), how many elements will be in the dictionary after the following code is executed? animal_class["monkey"] = "mammal" animal_class["bluejay"] = "bird" animal_class["frog"] = "amphibian" 4 6 What is the value for key ? 312 255 The dictionary doesn't have key "book1" 456