Which of the following are the advantages of modular network architecture?

Which of the following are the advantages of modular network architecture?
A . It replaces the traditional hierarchical network model, making it easier to plan and deploy the network.
B . Allow different application functions or application systems to share data, resources and capabilities and participate in business processes
C . Allows dynamic invocation of IT resources through open interfaces to achieve a standard, compatible, secure, intelligent and manageable IT application environment
D . Each module can be planned and deployed separately. Network functions can be added or removed by adding or removing modules, which is conducive to building complex networks.

Answer: D