Amajor reason for 3-level architecture is to

flexibility to the user to access data at different levels with a personalized view.

Explanation:

The three layers are respectively :

1. Application layer

2. Presentation layer

3. Data layer

These different layers increases the reliability and easy management and also while working on it then different team could work independently and could later integrate their work.

answer; (b) agriculture, food, and natural resources;

can you include the statments that complete the question ?