In the communications industry, what are the features and benefits of using the layered OSI model?（）

• A、It encourages industry standardization by defining what functions occur at each layer of the model.
• B、It necessitates changes in functionality in one layer to other layers.
• C、It enables equipment efficiency from different vendors to use the same electronic components.
• D、It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
• E、It supports the evolution of multiple competing standards, and thus enhances business equipment manufacturing opportunities.