This type of organisational structure is most suitable when the size of the organisation is large and has diversified activities and operations that require a high degree of specialisation.
Functional structure
Answer (b) Functional structure
Explanation: A functional organisational design is a structure used to coordinate employees, and they are grouped depending on their particular abilities and knowledge. It is a vertically structured organisation with all divisions regarding jobs, from the President to the Finance department and Sales departments, to client care, to representatives doled out to one service or product.