Claude Certified Developer, Foundations CCDV-F practice exam

A company must classify 2 million archived support tickets by end of week. No user is waiting on any individual result. Which API capability cuts the cost of this job roughly in half?

1. Extended thinking, because it reasons more efficiently
2. The Message Batches API — submitting the classifications as asynchronous batch jobs billed at a 50% discount ✓ (correct)
3. Streaming each classification to avoid idle connections
4. Prompt prefilling, which halves the output tokens

An engineer must design one prompt that handles three distinct tasks — summarize a ticket, draft a reply, and tag its category — and quality is inconsistent. Each task alone works well in isolation. What is the most reliable restructuring?

1. Ask for the three outputs in a strict order inside clearly labeled XML sections, or split the work into separate API calls per task if quality still lags ✓ (correct)
2. Raise temperature so the model can juggle multiple objectives more creatively
3. Merge the three tasks into one open-ended request so Claude can decide what matters
4. Use stop sequences to cut the response after the summary and infer the rest downstream

In a code review workflow, an engineer wants Claude Code to first propose a plan of changes for human approval before touching any files. Which built-in workflow supports this?

1. Deleting write permissions permanently so no edit is ever possible
2. Plan mode — Claude explores and drafts a plan in a read-only phase, and edits begin only after the user approves the plan ✓ (correct)
3. Running two separate installations, one for reading and one for writing
4. Asking Claude to describe changes in hexadecimal before applying them