If Planning a Systematic Observation Strategy for a Qualitative Analysis

If planning a systematic observation strategy for a qualitative analysis of a international standard discus thrower in a domestic competition, with only one camera available to you, which might be the most useful of the following in deciding where to position the camera?

A) Where TV cameras are, or would be, placed
B) From where the thrower's coach mostly observes in training
C) Which aspect of the throw you have decided to focus on
D) All of these might be very useful