Consider the following communication technologies:1.Closed-circuit Television2.Radio Frequency Identification3.Wireless Local Area NetworkWhich of the above are considered Short Range devices/technologies?

1. A

   1 and 2 only

   1 and 2 only. WLAN is also a short-range radio technology.

2. B

   2 and 3 only

   2 and 3 only. CCTV in the SRD/low-power sense is counted here.

3. C

   1 and 3 only

   1 and 3 only. RFID is the classic short-range device.

4. 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.