Orlando enjoys mountaineering along with a team. Though he is adventurous, he is also quite sensible. He is aware of the fact that no telecommunication link is available in the mountains. He knows that he may need to make calls to his team members if they are left behind, or in case he gets lost or injured. Which telecommunication device might be useful to an adventurer like Orlando? A.
two-way radio
B.
smartphone
C.
satphone
D.
palmtop computer