According to the following UML, if a new object of B is created in main as follows: B myB = new B0; Which of the following statements is NOT valid in main? + do stuff 10 +do_stuff20 do_stuff30 -b -do_b_stuffo do b stuff20 + do_c_stuff 10 de_c_stuff20 myB.do_b_stuff10; myB.do_b_stuff20: myB.do_stuff10; O myB.do_stuff30; Given the following UML, which statement below is not valid? A + do stutto + do_stuff20 -do_stuff30 B +do_b_stutto do b_stuff20 + do_c_stutto do_c_stuff20 Amyvar = new A0; B myvar = new BO; C myvar = new C(); A myvar = new BO; B myvar = new A0; A myvar = new CO