Your task is to simulate this analysis by creating a Python application that implements graph theory to achieve this. Your application must have the following:

A connections manager class with the following methods:

$-$Add user.

$-$Add connection.

$-$View all users.

$-$View all connections.

$-$Display a graph showing all connections in the network.

$(39$ Marks$)$

A main menu to select options $($the menu must be displayed to the user until the application terminates.

$(11$ Marks$)$

You must employ OOP in the creation of your application.