Which of the following is NOT one of the four layers of the TDM taxonomy?

• A. IT towers
• B. Data centers and networks
• C. Cost pools
• D. Applications and services

Answer: (B)

In this taxonomy, the layers are organized to group related technology assets and costs in a way that supports governance and optimization. Data centers and networks are part of the infrastructure domain and are treated as elements within the broad IT towers layer, not as a separate standalone layer. Keeping data centers and networks as their own layer would fragment the classification and make cost allocation less consistent. Therefore, data centers and networks aren’t counted as one of the four layers.