Sometimes, the interviewer can trick you by stating a particular phase number and asking you to describe it. Such questions are intended to test your quick thinking ability and how rapidly you can recollect an answer you know! So ensure to give the right answer. Take a second, pause, recollect and respond quickly. For this question, phase D in TOGAF ADM is Technology Architecture. It operates as the final pillar of BDAT architecture. So, your response can comprise a detailed description of phase D. For example, "Phase D in ADM is the technical architecture which comes after the IA architecture phase. Here, inputs like the communication plan and capability assessment (from phase A), the draft requirement (from phases B and C), product information, etc., are input to extract an output of the final technology architecture components on the roadmap.