Create three classes in C$++$ as shown below:

A$.$ A Class called $$ePen$$ and within it:

a$.$ Define two private data members: $$length$$ and $$thickness$.$

b$.$ A constructor that can call the $$setPen$$ method.

c$.$ A $$setPen$$ method can be used to set the two data members.

d$.$ Two get functions to get the value of the two data members

e$.$ Implement the methods: $$print$$ and $$printName$.$

f$.$ Create an object for this class, and call one of the pure virtual

methods; explain by comments the outcome of this call.

B$.$ A Class called $$USB$$ is to be implemented, as shown in Figure $2.$ Then create an object for this class and test your function calls.

C$.$ A Class called $$SmartPhone$$ is to be implemented, as shown in Figure $2.$Then create an object for this class and test your function calls.