2.4.............................................
D. all of the above
Explanation:
The best answer from the choices is option D all of the above.
Speed is a key component aspect of almost all sport.
What is speed:
Speed is the rate of change of distance with time;
Speed = 
distance is the path taken by a body
time is the duration of interval
In tennis, speed is very essential and critical same as soccer and swimming. In fact, sports with more speed have very good advantage at excelling.
learn more:
Speed brainly.com/question/10435836
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Answer:
The machine used is called a squaring shear, power shear, or guillotine.
Explanation: