A sports psychologist performed a study of some visualization techniques that she developed to improve athletic performance. She used amateur golfers and amateur tennis players as participants. In her:
a) Experiment, she assessed the effectiveness of visualization techniques on both amateur golfers and amateur tennis players.
b) Survey, she gathered opinions from amateur golfers and amateur tennis players about visualization techniques.
c) Workshop, she conducted sessions with amateur golfers and amateur tennis players to teach visualization techniques.
d) Presentation, she shared her findings on the impact of visualization techniques on amateur golfers and amateur tennis players.