Say you have implementations of all the classes in the following UML class diagram$($Figure $2)$:

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$1$ Write down the C$++$ code you would add to each class definition to define a toString$()$ member function for these classes. Note: Don't write implementations for these functions, just give the function headers that need to be added to the class definitions. $(3)$

$2$ Write an implementation of toString$()$ for the Stock class $($to be placed in stock.cpp$).$ It should return all the information about a Stock instance, including labels for each data member. The function must use partial overriding. $(4)$

$3$ Say you have the implementation of the AssetList class, as depicted in the following UML diagram$($Figure $3)$ :

UML

Write code for a function called outputAll$()$ to output the information of all the assets in an AssetList instance to the console $($i$.$e$.$ to the standard output device$).$ You can assume that a QTextStream called cout has been declared as a global variable. Note that the function should not be a member function of the AssetList class. It should be a stand$-$alone function that takes an AssetList as parameter. $(4)$

$4$ Explain the difference between polymorphism and polymorphic assignment, and state where they are applied in your answer to Question $3.(5)$

$5$ Explain why it is acceptable to make the AssetList parameter of the outputAll$()$ function a value parameter instead of a const$-$reference parameter or passing it by pointer.$(4)$