A
1 and 2 only
B
2 and 3 only
C
1 and 3 only
D
1, 2 and 3
Correct answer: (d) 1, 2 and 3
Explanation
- A
1 and 2 only
1 and 2 only. WLAN is also a short-range radio technology.
- B
2 and 3 only
2 and 3 only. CCTV in the SRD/low-power sense is counted here.
- C
1 and 3 only
1 and 3 only. RFID is the classic short-range device.
- D
1, 2 and 3
All three. CCTV, RFID and WLAN are all treated as short-range devices/technologies in this item.
Summary. Official key is (d) all three. Short-range devices cover low-power radio uses: RFID, WLAN, and closed-circuit video links as framed in the question.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.