How does muscle twitch, summation, and tetanus affect the strength and duration of muscle contraction?

a) Muscle twitch: single, brief contraction; Summation: sustained contraction; Tetanus: rapid contraction.
b) Muscle twitch: sustained contraction; Summation: rapid contraction; Tetanus: single, brief contraction.
c) Muscle twitch: rapid contraction; Summation: single, brief contraction; Tetanus: sustained contraction.
d) Muscle twitch: single, brief contraction; Summation: rapid contraction; Tetanus: sustained contraction.