Which of these equations can represent a physical equality?
(a) 3 m = 3 s
(b) 1 m = 1 m^2
(c) 3 m = 1 m+ 2 m^2
(d) 4 m^2 = 1 m^2 + 3 m^2
(e) All of them
(f) None of them
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