Legazint most likely follows b. a customer-based division.
Explanation:
The customer-based division is generally followed in an organization to split the functional areas based on the customer demand. This is mainly followed due to increase in production and sales. The working departments are classified into separate categories.
In the above scenario, customer-based division is followed in the law firm. This was done for the facilitation of the clients. The staffs are organized into separate departments based on the client demands. The common departments are federally incorporated organizations, partnerships, corporations, sole proprietorship and limited liability companies.