Write a Python program: Create a login and menu to a company intranet system that requires users (employees) to enter a username and password in order to view a menu of options (such as Time Reporting, Accounting, IT Helpdesk, Engineering Documents, etc. ).

Technical requirements:

Plaintext usernames/passwords/access level stored in a csv (or text) file

Create three different access levels (roles for different users). For example, User A should have access to all menu items ('admin' access), while User B has limited access (no Accounting or Engineering Documents), etc.

Once logged in the user should be able to select different menu options with a number input (for example, "press 1 for the Time Reporting area", "press 2 for the Accounting area", etc.)

When a user accesses a menu area they have access to, a simple message similar to 'You have now accessed the accounting application' is sufficient to indicate a successful demonstration of the access control (no need to build out any actual accounting functionality). Likewise, if a user does not have the appropriate access level to view a menu area, the program should display a 'You are not authorized to access this area.' message and provide an option to return them to the main menu.