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Given the following inheritance chain, which instructions will execute in main correctlya. quadA$^(**)$a$=$ new C$()$;a$->$ xxx$()$;b$.$ B$^(**)$b$=$ new B$()$;b$->$ yyy$0$;c$.$ A$**$a$=$newA$()$;a$->$ xxx$()$ :d$.$ quad A $*$a$=$new B$()$;a$->$ yyy$(0$ :