Consider the following activities :
1. Spraying pesticides on a crop field.
2. Inspecting the craters of active volcanoes.
3. Collecting breath samples from spouting whales for DNA analysis.
Q. At the present level of technology, which of the above activities can be successfully carried out by using drones ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3