I want a straightforward, console-based student management application written in Python 3. All records must be kept permanently in a plain-text file called students.txt, handled through standard file-read/write operations—no external databases. Core operations the menu must offer: • Add a new student record (name, roll number, class, marks) • List every stored student with neat, column-aligned output • Search instantly by roll number • Update existing marks (without touching the rest of the record) • Delete a record and tidy the file so no blank lines remain Security is important, so the program begins with a small login module. Credentials can live in a separate text file and support three distinct roles: Admin, Teacher, and Student. • Admin – full access to every function • Teacher – view, search, and update marks only • Student – view their own record after authenticating with roll number and password Please keep the interface simple—clear prompts, input validation, and concise success/error messages. The whole system should run from the command line on any standard Python 3 interpreter without extra libraries. Deliverables 1. Well-commented .py source files (menu, login, data operations) 2. Sample students.txt and credentials file for quick testing 3. A short README explaining setup, role permissions, and how to extend the code Acceptance criteria • Running main.py launches the login prompt, then the correct role-based menu • All CRUD actions update students.txt immediately and accurately • Code passes a quick review on PEP 8 basics and logical structure That’s the full scope—lean, functional, and ready for further expansion once this foundation is solid.