Mr. Naik is a paramilitary Intelligence Corps officer who is tasked with planning a coup on the enemy at a certain date. Currently he is inspecting the area standing on top of the cliff. Agent Vinod is on a hot air ballon in the sky. When Mr. Naik looks down below the cliff towards the sea, he has Ajay and Maran in boats positioned to get a good vantage point.
The main goal is to scope out the range and angles at which they should train their soldiers.
which one is a pair of 'angles of depression'?

Options

A. `(lt a^(@), lt e^(@))`
B. `(lt b^(@), lt e^(@))`
C. `(lt c^(@), lt d^(@))`
D. `(lt a^(@), lt f^(@))`

Answer

C