Dimethylbutane gives a significant fragment peak at m/z = 57. Which of the following is the most probable structure of the fragment ion?
a) CH₃CH₂CH₂CH₂⁺
b) CH₃CH₂CH₂⁺
c) CH₃CH₂CH₂CH₂CH₃⁺
d) CH₃CH₂CH₂CH₃⁺

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