The abstract noun forms of the verb to object are objection and the gerund, objecting.

True - an instance of an abstract class cannot be created.

False - derive (subclass) from a class, not the object (the instance).

Platonism is the view that there exist such things as abstract objects. An abstract object is an object that does not exist in space or time.

concrete

An abstract factory pattern is a creational design pattern which decouples the object creation by providing a group of individual factories by defining an abstract factory class.