Hybrid model is usually what official guides push for multi-pattern projects like this. So C fits best, since CPMAI recommends combining and splitting phases as needed. Not 100 percent but that's what I keep seeing in practice exams, anyone disagree?
C tbh. Phase III in CPMAI is where the heavy lifting on data prep, cleaning, and enhancement goes down, just before modeling. I get why some might pick D since tweaks happen later, but the bulk of cleaning is definitely in III. The wording here points to main prep not post-modeling corrections. Disagree?
I don’t think it’s D. B is the issue, since without model versioning you can't restore the original when a new model underperforms. D can be tempting, but iteration doesn’t guarantee you'll keep previous deployable models. Seen similar questions in practice exams-pretty sure B is correct here, but feel free to challenge if you see it differently.
A imo, had something like this in a mock. Dimensionality reduction is literally the process for cutting down variables, not rows. Pretty sure that's what PMI wants here, but open to pushback if I'm missing some nuance.
Not C here. The mention of "trial and error" is a giveaway for B (Reinforcement Learning), since that approach learns by interacting with the environment and getting feedback, not from labeled data sets like Supervised Learning. D is a distractor, because only reinforcement fits that scenario directly. Open to other interpretations if I'm missing something though.