Which code segment would result in a memory leak? int x= new int; int y= new int; y=x; int x= new int; int y= new int; int z; z=x; int x= new int; int y= new int; int z=y int x= new int; int y= new int; x=x; QUESTION 18 You should set a pointer to nullptr if it is not being used or does not contain a valid address. True False QUESTION 19 One way to avoid a potential memory leak in a funciton is to avoid returning a pointer to a newly created object. True False