Q. In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.To have at one's fingertips
A) To be adroit with a percussion musical instrument
B) To be very fast on the keyboard
C) To carefully note down minute details
D) Recall of factual information at one's command
✔ Correct Answer: Recall of factual information at one's command
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