Which word is the closest synonym for 'proprietary' in a technical context?
答案解析
**Core Concept:** Vocabulary precision in technical terms.
**Analysis:**
- **Correct Answer (C):** 'Proprietary' implies ownership and restricted access, aligning with 'exclusive.'
- **Error Options:**
- A and B: Antonyms (proprietary ≠ publicly shared).
- D: Refers to outdatedness, not ownership status.
**Nuance:** Context matters—'exclusive' here refers to legal control, not general availability.
正确答案：C